Many third party advertisers use cookies and beacons that provide them with information about your geographic location, browser type and version, number of screen colors, screen resolution, and probably language, etc. This enables them to provide you with a better user experience. However, the option can be disabled in the privacy settings of your web browser. As a third party vendor, Google also uses a cookie type called DART cookie, to serve ads based on the end users visits to other sites. You can opt out of the DART cookie at the Google ad and content network.