Cookies are text files containing information. They are stored on the hard drive of your computer without causing any damage there.
For maintaining a log-in session, we therefore use so-called session cookies. Session cookies are small information units containing an arbitrarily generated identification number called Session ID, which are stored in your computer's memory. A session cookie furthermore stores information on its origin and storage period. These cookies cannot store any other data. As soon as you log out from the members’ area, the session cookies used are deleted.