SEO
Search Engine Optimization (SEO) is a set of methods concentrated on improving the ranking of a website in the search engine listing and can also be considered as a subset of search engine marketing.
In the middle of 1990s, Webmasters started optimizing sites for search engines. In the first place, all a webmaster needed was to suggest a page (URL) to the various engines that would send a spider to catch the page or external links to other pages from it. Spider returns information found on the page which has been indexed. The process engages a search engine spider downloading and storing a page on the server of search engine, where a second program (indexer), imports various information about the page. The information includes the words in content of page and where these are located, any weight for specific words and all links the page contains. Then links placed into a scheduler for catching at a later date.
All search engine rankings are decided by an algorithm of search engine spider. An algorithm consists of some logical steps: