Some cookies allow sites to understand how visitors interact with their properties. For example, Google Analytics, a Google product that helps site and app owners understand how users interact with a service, uses a set of cookies to collect information and generate site usage statistics without providing personal information on individual visitors. to Google. The main cookie used by Google Analytics is "_ga". This cookie allows a service to distinguish one user from another and lasts for 2 years. It is used by any site that implements Google Analytics, including Google services.