Starting March 1, Google is unifying its privacy policies to share the data it collects about users between all of its products. That means your web searches and sites you visit will be combined with other Google products like Google+ and YouTube. If you'd rather avoid that, the Electronic Frontier Foundation reminds us you can remove your Google search history and stop it from being recorded.

http://lifehacker.com/5887310/how-to-remove-your-google-web-history-before-the-new-privacy-policy-change