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    .    .

 Search Engine Optimization (SEO):  Definition/Meaning & Principles
(Wikimedia Foundation, Inc. Minor edits by Eric Gondwe)

    * A Introduction
    * B Major Types of Internet Marketing
    * 1 History
    * 2 Relationship with search engines
    * 3 Methods
          o 3.1 Getting indexed
          o 3.2 Preventing crawling
          o 3.3 Increasing prominence
    * 4 White hat versus black hat
    * 5 Gray hat techniques
    * 6 As a marketing strategy
    * 7 International markets
    * 8 Legal precedents
    * 9 See also
    * 10 Notes
    * 11 External links

Search engine optimization (SEO) is the process of improving the volume or quality of traffic to a web site from search engines via "natural" or un-paid ("organic" or "algorithmic") search results as opposed to search engine marketing (SEM) which deals with paid inclusion.

Typically, the earlier (or higher) a site appears in the search results list, the more visitors it will receive from the search engine. SEO may target different kinds of search, including image search, local search, video search and industry-specific vertical search engines. This gives a web site web presence.

As an Internet marketing strategy, SEO considers how search engines work and what people search for. Optimizing a website primarily involves editing its content and HTML and associated coding to both increase its relevance to specific keywords and to remove barriers to the indexing activities of search engines.

The acronym "SEO" can refer to "search engine optimizers," a term adopted by an industry of consultants who carry out optimization projects on behalf of clients, and by employees who perform SEO services in-house. Search engine optimizers may offer SEO as a stand-alone service or as a part of a broader marketing campaign.

Because effective SEO may require changes to the HTML source code of a site, SEO tactics may be incorporated into web site development and design. The term "search engine friendly" may be used to describe web site designs, menus, content management systems, images, videos, shopping carts, and other elements that have been optimized for the purpose of search engine exposure.

Another class of techniques, known as black hat SEO or spamdexing, use methods such as link farms, keyword stuffing and article spinning that degrade both the relevance of search results and the user-experience of search engines. Search engines look for sites that employ these techniques in order to remove them from their indices.

Major Types of Internet Marketing
General types:
Display advertising
E-mail marketing
E-mail marketing software
Interactive advertising
Social media optimization
Web analytics
Cost per impression
Affiliate marketing:
      Cost per action
      Contextual advertising
      Revenue sharing
Search engine marketing:
      Search engine optimization
      Pay per click advertising
      Paid inclusion
      Search analytics
Mobile advertising

Webmasters and content providers began optimizing sites for search engines in the mid-1990s, as the first search engines were cataloging the early Web. Initially, all a webmaster needed to do was submit the address of a page, or URL, to the various engines which would send a spider to "crawl" that page, extract links to other pages from it, and return information found on the page to be indexed.[1]

The process involves a search engine spider downloading a page and storing it on the search engine's own server, where a second program, known as an indexer, extracts various information about the page, such as the words it contains and where these are located, as well as any weight for specific words, and all links the page contains, which are then placed into a scheduler for crawling at a later date.

Site owners started to recognize the value of having their sites highly ranked and visible in search engine results, creating an opportunity for both white hat and black hat SEO practitioners. According to industry analyst Danny Sullivan, the phrase search engine optimization probably came into use in 1997.[2]

Early versions of search algorithms relied on webmaster-provided information such as the keyword meta tag, or index files in engines like ALIWEB. Meta tags provide a guide to each page's content. But using meta data to index pages was found to be less than reliable because the webmaster's choice of keywords in the meta tag could potentially be an inaccurate representation of the site's actual content. Inaccurate, incomplete, and inconsistent data in meta tags could and did cause pages to rank for irrelevant searches.[3] Web content providers also manipulated a number of attributes within the HTML source of a page in an attempt to rank well in search engines.[4]

By relying so much on factors such as keyword density which were exclusively within a webmaster's control, early search engines suffered from abuse and ranking manipulation. To provide better results to their users, search engines had to adapt to ensure their results pages showed the most relevant search results, rather than unrelated pages stuffed with numerous keywords by unscrupulous webmasters.

Since the success and popularity of a search engine is determined by its ability to produce the most relevant results to any given search, allowing those results to be false would turn users to find other search sources. Search engines responded by developing more complex ranking algorithms, taking into account additional factors that were more difficult for webmasters to manipulate.

Graduate students at Stanford University, Larry Page and Sergey Brin, developed "backrub," a search engine that relied on a mathematical algorithm to rate the prominence of web pages. The number calculated by the algorithm, PageRank, is a function of the quantity and strength of inbound links.[5] PageRank estimates the likelihood that a given page will be reached by a web user who randomly surfs the web, and follows links from one page to another. In effect, this means that some links are stronger than others, as a higher PageRank page is more likely to be reached by the random surfer.

Page and Brin founded Google in 1998. Google attracted a loyal following among the growing number of Internet users, who liked its simple design.[6] Off-page factors (such as PageRank and hyperlink analysis) were considered as well as on-page factors (such as keyword frequency, meta tags, headings, links and site structure) to enable Google to avoid the kind of manipulation seen in search engines that only considered on-page factors for their rankings.

Although PageRank was more difficult to game, webmasters had already developed link building tools and schemes to influence the Inktomi search engine, and these methods proved similarly applicable to gaming PageRank. Many sites focused on exchanging, buying, and selling links, often on a massive scale. Some of these schemes, or link farms, involved the creation of thousands of sites for the sole purpose of link spamming.[7]

By 2004, search engines had incorporated a wide range of undisclosed factors in their ranking algorithms to reduce the impact of link manipulation. Google says it ranks sites using more than 200 different signals.[8] The leading search engines, Google and Yahoo, do not disclose the algorithms they use to rank pages.

Notable SEOs, such as Rand Fishkin, Barry Schwartz, Aaron Wall and Jill Whalen, have studied different approaches to search engine optimization, and have published their opinions in online forums and blogs.[9][10] SEO practitioners may also study patents held by various search engines to gain insight into the algorithms.[11]

In 2005 Google began personalizing search results for each user. Depending on their history of previous searches, Google crafted results for logged in users.[12] In 2008, Bruce Clay said that "ranking is dead" because of personalized search. It would become meaningless to discuss how a website ranked, because its rank would potentially be different for each user and each search.[13]

In 2007 Google announced a campaign against paid links that transfer PageRank.[14] On June 15 2009, Google disclosed that they had taken measures to mitigate the effects of PageRank sculpting by use of the nofollow attribute on links. Matt Cutts, a well known software engineer at Google, announced that Google Bot would no longer treat nofollowed links in the same way, in order to prevent SEOs from using nofollow for PageRank sculpting[15].

As a result of this change the usage of nofollow leads to evaporation of pagerank. In order to avoid the above, SEOs developed alternative techniques that replace nofollowed tags with obfuscated Javascript and thus permit PageRank sculpting. Additionally several solutions have been suggested that include the usage of iframes, flash and javascript. [16]

In December 2009 Google announced it would be using the web search history of all its users in order to populate search results [17].

Real-time-search was introduced in late 2009 in an attempt to make search results more timely and relevant. Historically site administrators have spent months or even years optimizing a website to increase search rankings. With the growth in popularity of social media sites and blogs the leading engines made changes to their algorithms to allow fresh content to rank quickly within the search results. [18] This new approach to search places importance on current, fresh and unique content.

Relationship with search engines
By 1997 search engines recognized that webmasters were making efforts to rank well in their search engines, and that some webmasters were even manipulating their rankings in search results by stuffing pages with excessive or irrelevant keywords. Early search engines, such as Infoseek, adjusted their algorithms in an effort to prevent webmasters from manipulating rankings.[19]

Due to the high marketing value of targeted search results, there is potential for an adversarial relationship between search engines and SEOs. In 2005, an annual conference, AIRWeb, Adversarial Information Retrieval on the Web,[20] was created to discuss and minimize the damaging effects of aggressive web content providers.

SEO companies that employ overly aggressive techniques can get their client websites banned from the search results. In 2005, the Wall Street Journal reported on a company, Traffic Power, which allegedly used high-risk techniques and failed to disclose those risks to its clients.[21] Wired magazine reported that the same company sued blogger and SEO Aaron Wall for writing about the ban.[22] Google's Matt Cutts later confirmed that Google did in fact ban Traffic Power and some of its clients.[23]

Some search engines have also reached out to the SEO industry, and are frequent sponsors and guests at SEO conferences, chats, and seminars. In fact, with the advent of paid inclusion, some search engines now have a vested interest in the health of the optimization community. Major search engines provide information and guidelines to help with site optimization.[24][25][26] Google has a Sitemaps program[27] to help webmasters learn if Google is having any problems indexing their website and also provides data on Google traffic to the website. Google guidelines are a list of suggested practices Google has provided as guidance to webmasters. Yahoo! Site Explorer provides a way for webmasters to submit URLs, determine how many pages are in the Yahoo! index and view link information.[28]

          A) Getting indexed
The leading search engines, such as Google and Yahoo!, use crawlers to find pages for their algorithmic search results. Pages that are linked from other search engine indexed pages do not need to be submitted because they are found automatically. Some search engines, notably Yahoo!, operate a paid submission service that guarantee crawling for either a set fee or cost per click.[29] Such programs usually guarantee inclusion in the database, but do not guarantee specific ranking within the search results.[30] Two major directories, the Yahoo Directory and the Open Directory Project both require manual submission and human editorial review.[31] Google offers Google Webmaster Tools, for which an XML Sitemap feed can be created and submitted for free to ensure that all pages are found, especially pages that aren't discoverable by automatically following links.[32]

Search engine crawlers may look at a number of different factors when crawling a site. Not every page is indexed by the search engines. Distance of pages from the root directory of a site may also be a factor in whether or not pages get crawled.[33]

          B) Preventing crawling
To avoid undesirable content in the search indexes, webmasters can instruct spiders not to crawl certain files or directories through the standard robots.txt file in the root directory of the domain. Additionally, a page can be explicitly excluded from a search engine's database by using a meta tag specific to robots. When a search engine visits a site, the robots.txt located in the root directory is the first file crawled.

The robots.txt file is then parsed, and will instruct the robot as to which pages are not to be crawled. As a search engine crawler may keep a cached copy of this file, it may on occasion crawl pages a webmaster does not wish crawled. Pages typically prevented from being crawled include login specific pages such as shopping carts and user-specific content such as search results from internal searches. In March 2007, Google warned webmasters that they should prevent indexing of internal search results because those pages are considered search spam.[34]

          C) Increasing prominence
A variety of other methods are employed to get a webpage shown up at the search results. These include:

    * Cross linking between pages of the same website. Giving more links to main pages of the website, to increase PageRank used by search engines.[35] Linking from other websites, including link farming and comment spam. However, link spamming can also have a bad impact on your search result position.
    * Writing content that includes frequently searched keyword phrase, so as to be relevant to a wide variety of search queries.[36] Adding relevant keywords to a web page meta tags, including keyword stuffing.
    * URL normalization of web pages accessible via multiple urls, using the "canonical" meta tag.[37]

White hat versus black hat SEO
SEO techniques can be classified into two broad categories: techniques that search engines recommend as part of good design, and those techniques of which search engines do not approve. The search engines attempt to minimize the effect of the latter, among them spamdexing. Some industry commentators have classified these methods, and the practitioners who employ them, as either white hat SEO, or black hat SEO.[38]

White hats tend to produce results that last a long time, whereas black hats anticipate that their sites may eventually be banned either temporarily or permanently once the search engines discover what they are doing.[39] White hat seo An SEO technique is considered white hat if it conforms to the search engines' guidelines and involves no deception. We can say the legal seo is a white hat seo.

As the search engine guidelines[24][25][26][40] are not written as a series of rules or commandments, this is an important distinction to note. White hat SEO is not just about following guidelines, but is about ensuring that the content a search engine indexes and subsequently ranks is the same content a user will see. White hat advice is generally summed up as creating content for users, not for search engines, and then making that content easily accessible to the spiders, rather than attempting to trick the algorithm from its intended purpose. White hat SEO is in many ways similar to web development that promotes accessibility,[41] although the two are not identical.

Black hat SEO attempts to improve rankings in ways that are disapproved of by the search engines, or involve deception. One black hat technique uses text that is hidden, either as text colored similar to the background, in an invisible div, or positioned off screen. Another method gives a different page depending on whether the page is being requested by a human visitor or a search engine, a technique known as cloaking Invisible iframes is yet another black hat SEO technique, where a page you see is not necessarily from the company that is hosting that webpage. People create these types of pages in order to download software on your computer in the background without your knowledge .

Search engines may penalize sites they discover using black hat methods, either by reducing their rankings or eliminating their listings from their databases altogether. Such penalties can be applied either automatically by the search engines' algorithms, or by a manual site review. Infamous examples are the February 2006 Google removal of both BMW Germany and Ricoh Germany for use of deceptive practices.[42] and the April 2006 removal of the PPC Agency BigMouthMedia.[43] All three companies, however, quickly apologized, fixed the offending pages, and were restored to Google's list.[44]

Many Web applications employ back-end systems that dynamically modify page content (both visible and meta-data, for example the page title or meta-keywords) and are designed to increase page relevance to search engines based upon how past visitors reached the original page. This dynamic search engine optimization and tuning process can be (and has been) abused by criminals in the past. Exploitation of Web applications that dynamically alter themselves can be poisoned.[45]

Gray hat techniques
Gray hat techniques are those that are neither really white nor black hat. Some of these gray hat techniques may be argued either way. These techniques might have some risk associated with them. A very good example of such a technique is purchasing links. The average price for a text link depends on the page rank of the linking page.

While Google is against sale and purchase of links there are people who subscribe to online magazines, memberships and other resources for the purpose of getting a link back to their website.

Another widely used gray hat technique is a webmaster creating multiple 'micro-sites' which he controls for the sole purpose of cross linking to the target site. Since it is the same owner of all the micro-sites, this is a violation of the principles of the search engine's algorithms (by self-linking) but since ownership of sites is not traceable by search engines it is impossible to detect and therefore they can appear as different sites, especially when using separate Class-C IPs.

As a marketing strategy
Eye tracking studies have shown that searchers scan a search results page from top to bottom and left to right (for left to right languages), looking for a relevant result. Placement at or near the top of the rankings therefore increases the number of searchers who will visit a site.[46] However, more search engine referrals does not guarantee more sales. SEO is not necessarily an appropriate strategy for every website, and other Internet marketing strategies can be much more effective, depending on the site operator's goals.[47]

A successful Internet marketing campaign may drive organic traffic to web pages, but it also may involve the use of paid advertising on search engines and other pages, building high quality web pages to engage and persuade, addressing technical issues that may keep search engines from crawling and indexing those sites, setting up analytics programs to enable site owners to measure their successes, and improving a site's conversion rate.[48]

SEO may generate a return on investment. However, search engines are not paid for organic search traffic, their algorithms change, and there are no guarantees of continued referrals. (Some trading sites such as eBay can be a special case for this, it will announce how and when the ranking algorithm will change a few months before changing the algorithm )Due to this lack of guarantees and certainty, a business that relies heavily on search engine traffic can suffer major losses if the search engines stop sending visitors.[49]

It is considered wise business practice for website operators to liberate themselves from dependence on search engine traffic.[50] A top-ranked SEO blog Seomoz.org[51] has suggested, "Search marketers, in a twist of irony, receive a very small share of their traffic from search engines." Instead, their main sources of traffic are links from other websites.[52]

International markets
Optimization techniques are highly tuned to the dominant search engines in the target market. The search engines' market shares vary from market to market, as does competition. In 2003, Danny Sullivan stated that Google represented about 75% of all searches.[53] In markets outside the United States, Google's share is often larger, and Google remains the dominant search engine worldwide as of 2007.[54] As of 2006, Google had an 85-90% market share in Germany.[55] While there were hundreds of SEO firms in the US at that time, there were only about five in Germany.[55] As of June 2008, the marketshare of Google in the UK was close to 90% according to Hitwise.[56] That market share is achieved in a number of countries.[57]

As of 2009, there are only a few large markets where Google is not the leading search engine. In most cases, when Google is not leading in a given market, it is lagging behind a local player. The most notable markets where this is the case are China, Japan, South Korea, Russia and Czech Republic where respectively Baidu, Yahoo! Japan, Naver, Yandex and Seznam are market leaders.

Successful search optimization for international markets may require professional translation of web pages, registration of a domain name with a top level domain in the target market, and web hosting that provides a local IP address. Otherwise, the fundamental elements of search optimization are essentially the same, regardless of language.[55]

Legal precedents
On October 17, 2002, SearchKing filed suit in the United States District Court, Western District of Oklahoma, against the search engine Google. SearchKing's claim was that Google's tactics to prevent spamdexing constituted a tortious interference with contractual relations. On May 27, 2003, the court granted Google's motion to dismiss the complaint because SearchKing "failed to state a claim upon which relief may be granted."[58][59]

In March 2006, KinderStart filed a lawsuit against Google over search engine rankings. Kinderstart's web site was removed from Google's index prior to the lawsuit and the amount of traffic to the site dropped by 70%. On March 16, 2007 the United States District Court for the Northern District of California (San Jose Division) dismissed KinderStart's complaint without leave to amend, and partially granted Google's motion for Rule 11 sanctions against KinderStart's attorney, requiring him to pay part of Google's legal expenses.[60][61]

See also
    * List of search engines
    * Image search optimization
    * Search engine optimization copywriting

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External links
    * Google Webmaster Guidelines
    * Yahoo! Webmaster Guidelines
    * Bing Webmaster Guidelines
    * Ask.com Webmaster Guidelines

Search engine optimization
Exclusion standards: Robots exclusion standard Meta tags nofollow

Related marketing topics: Internet marketing E-mail marketing Display advertising Web analytics

Search marketing related topics: Search engine marketing Social media optimization Online identity management Paid inclusion Pay per click (PPC) Google bomb

Search engine spam: Spamdexing Web scraping Scraper site Link farm Free for all linking

Linking: Off-page optimization Methods of website linking Link exchange Backlink

Other: IP delivery Human search engine Stop words Poison words

Source/Author: Wikimedia Foundation, Inc., Wikipedia, “Search Engine Optimization,” (accessed January 22, 2010). Minor edits by Eric Gondwe.

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