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Search Engine Optimization (SEO) is a process to improve the site or web page search engine visibility "natural" if and paid ("organic" or "algorithmic") results. In general, the earlier (or higher rank on search results page), and frequent site appears in the search results list, the more visitors it will receive from the search engine users. SEO may target different kinds of search, including image search, local search, video search engine, Academic Search, news, search, and industry-specific vertical search engines.

As the online marketing strategy, SEO considers how search engines work, what people are looking for the actual search terms or keywords entered into search engines and which search engines give priority to their target audience. Optimize your site, you may need to edit its content and HTML coding concerns and to increase its relevance to specific keywords and to remove barriers to indexing activities of search engines. Promoting a website to increase back links or inbound links, there is another SEO tactic.

The acronym "SEO" can mean "search engine optimizers", terms adopted by the industry of consultants who carry out optimization projects on behalf of customers and employees who perform SEO services in-house. SEO may offer SEO as a stand-alone service or as part of a broader marketing campaign. Because effective SEO may require changes to the HTML source code of the site and the contents of the site, SEO tactics may be incorporated into web site development and design. The term "search engine friendly" may be used to describe the site design, menus, content management systems, images, videos, shopping carts and other items that have been optimized for the search targets.

Webmasters and content providers began optimizing sites search in the middle of 1990, as the first pre-filing searches on the Internet. Initially, all webmasters needed to do was provide the URL of the page, the various engines that would send "spiders" crawl "that page, extract from his links to other pages, and return information found in the page to be indexed. This process is associated with the search engine spiders to the download page and save it into a search engine on your server, where the second program, known as an indexer, which extracts various information about the page, for example. With words in it and where they are located, as well as mass, but the specific words and the page are all links that are then placed in the planning, scanning later.

Site owners started to recognize their sites are highly valued and visible in search results, and a white hat and black hat SEO practices to create value. According to industry analyst Danny Sullivan, the phrase "search engine optimization" was probably introduced in 1997. The term Search Engine Optimization the first documented use of John Audette and his company Media Marketing Group documents at the site of the MMG from August, 1997.

Early versions of search algorithms relied on webmaster information, such as the keyword Meta tag, or index files in engines like ALIWEB. Meta tags for each page manual content. Using Meta data to index it was found that less than reliable, but because the webmaster choice keywords Meta tag could potentially be an inaccurate representation of the actual content site. Inaccurate, incomplete and inconsistent data and Meta tags caused pages rank irrelevant searches. Web content providers also manipulated the attributes in the HTML source page in an attempt to rank well in search engines.

Trust and a number of factors such as keyword density, which was only a webmaster control, early search suffered from abuse and ranking manipulation. For better results, 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. The success and popularity of its search engine provides the ability to produce the most relevant results, but a specific search, so these results are false, would turn users to find other search sources. Search engines responded the development of more complex ranking algorithms, taking into account additional factors, it was difficult to manipulate by webmasters. Graduate students at Stanford University, Larry Page and Sergey Brin, Back Rub, the search engine, which was based on a mathematical algorithm to rate web pages of attention. The number is calculated according to the algorithm, Page Rank, quantity and strength of inbound links function. the Page Rank assess the likelihood that the page will be achieved by the Internet user who accidentally surf the Internet, and as links from one page to another. Actually, it means that some links are stronger than others, due to higher Page Rank page is more likely to be achieved by the random surfer.

Page and Brin, founded Google in 1998. Google attracted a loyal following among the growing number of Internet users, who love its simple design. [8] Off-page factors (such as Page Rank and hyperlink analysis) were considered, as well as page factors (such as keyword frequency, meta tags, headings, links and site structure) to enable Google to avoid manipulation kind of seen that it is only considered to be factors in their ranking pages in search engines. Although Page Rank was more difficult to game, webmasters have the link-building measures and systems to influence the Inktomi search engine, and these methods proved similarly applicable gaming Page Rank. Many sites mainly to exchange, buy, and sell links, often en masse. Some of them or link farms, involved thousands of websites with the sole purpose of link spamming building.

Until 2004, Search was added a wide range of undisclosed factors for their ranking algorithms to reduce the impact of link manipulation. Google says it ranks sites using more than 200 different signals. The leading search engine, Google, Bing, and Yahoo, do not they use algorithms to rank pages. SEO service providers such as Rand Fish kin, Barry Schwartz, Aaron Wall and Jill Whalen, have studied different approaches to search engine optimization, and issued its opinion on Internet forums and blogs. SEO practitioners may also study the different search engines to gain insight into the patenting of algorithms.

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