Google’s business model is based on delivering relevant search results and, increasingly, relevant ads to those who use its products. In order to do so, Google needs to know a user’s search history since search history and web site navigation offer important data about a user’s interests.

As many people know, web sites use files known as “cookies” to track user movements/logins as they traverse the web. But web browsers such as Microsoft’s Internet Explorer, Apple’s Safari and others provide privacy controls that allow users to turn cookies on or off. http://bit.ly/O0yEX2