Search engine optimization is the art and science of making web pages attractive to internet search engines. Some interne t businesses consider search engine optimization to be the subset of search engine marketing.
In the middle of the 1990s webmasters and search engine content providers started optimizing websites. At the time all the webmasters had to do was 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.