The definition of cookies is explained above. The purpose of the cookie is the optimization and display of advertising. The cookie is used, inter alia, to display and place user-relevant advertising as well as to create or improve reports on advertising campaigns. Furthermore, the cookie serves to avoid multiple display of the same advertisement.</p> <p>DoubleClick uses a cookie ID that is required to execute the technical process. For example, the cookie ID is required to display an advertisement in a browser. DoubleClick may also use the Cookie ID to record which advertisements have already been displayed in a browser in order to avoid duplications.