Search engines run with the concept of huge databases of web sites that surfers can search by typing in some text. 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. It makes heavy use of link popularity as a primary way to rank web sites. This can be especially helpful in finding good sites in response to general searches such as "cars" and "travel," because users across the web have in essence voted for good sites by linking to them. Google also has a huge index of the web and provides some results to Yahoo and Netscape Search.