Search engines are the most important source of new web site visitors. Almost 50 percent of site visits begin at the search engine and a lot of traffic is generated. Search engines are the path makers between the web pages and the web users. Any new visitor to a particular website comes through a search engines whether it is Google, Yahoo, MSN or any other search engine. About 80 percent of people, going online planning to shop for something or subscribe for any of the services start with any of the major search engine. Some of the major search engines serving World Wide Web are as follows: