Cookies are text files that contain data from visited websites or domains and are stored by a browser on the user's computer. A cookie is primarily used to store information about a user during or after his visit within an online service. The information stored can include, for example, the language settings on a website, the login status, a shopping basket or the location where a video was viewed. The term "cookies" also includes other technologies that fulfil the same functions as cookies (e.g. if user information is stored using pseudonymous online identifiers, also referred to as "user IDs").
The following types and functions of cookies are distinguished: