Search engines run with the concept of huge databases of web sites that surfers can search by typing in some text. Each search engine has its own formula for indexing pages; some index the whole site, while others index only the main page. Google has a well-deserved reputation as the top choice for those searching the web. The crawler-based service provides both comprehensive coverage of the web along with great relevancy. Google also has a huge index of the web and provides some results to Yahoo and Netscape Search.