SEO is an art of making your website attractive to search engines. Some of the internet businesses consider search engine optimization to be the subset of Search Engine Marketing.
In early 1990’s webmasters and content providers started optimizing websites. At that time all the webmasters had to provide a URL to a search engine and a web crawler would be sent from the search engine. The web crawler would extract link from the webpage and use the information to index the page by down loading the page and then storing it on the search engines server. Once the page was stored on the search engines server a second program, called an indexer, extracted additional information from the webpage, and determines the weight of specific words. When this was complete the page was ranked.
It didn’t take very long for people to understand the importance of being highly ranked. In the beginning search engines used search algorithms that webmasters provided about the web pages. It didn’t take webmasters very long to start abusing the system requiring search engines to develop a more sophisticated form of search engine optimization.
The search engines developed a system that considered several factors; domain name, text within the title, URL directories, term frequency, HTML tags, on page key word proximity, Alt attributes for images, on page keyword adjacency, text within NOFRAMES tags, web content development, Sitemaps, and on page keyword sequence.
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