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1.Preference            Most Google will have preference cookie called "NID"  in their browser. A browser sends NID to Google sites and there is an ID in it. and it helps to keep a track of the languages we use and some activities we do.   2.Security            Security cookie for authenticate users and prevent fraudulent use of login and protect user data from unauthenticated parties. 3.Process            Make website work and deliver services that website visitors expect. 4.Advertising            Help to customize ads on Google properties.  5.Session state 6.Analytics            Google's analytics tool that helps website and app owners to understand how their visitors engage with their properties. content - Google_cookies

Google uses pattern recognition to make the sense of image                        Facial detection is used and and this technology that helps Google to protect the privacy on services like Street View, where computers try to detect and then blur the faces of any people that may have been standing on the street as the Street View car drove by.                      It is also what helps services like Google+ photos suggest that when tagging a photo or video, since it seems like there might be a face present. Facial detection won’t tell  whose face it is, but it can help to find the faces in the photos. Google page