Google Analytics

Google Analytics is an online service for website owners which allows them to learn who uses their website and how. While it is easy to install and use for these webmasters, it means that information on all the users on this website is sent to Google where it is stored and correlated with your use of other Google services which you may use knowingly (searches, email, contacts, calendar and many others) or unknowingly (Adsense, G+ icons on other websites, Google CAPTCHA, content hosted in the Google cloud etc.). This allows Google to effectively track your Internet use across most websites, whether or not they are directly related to Google.