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In the case of websites that use [[HTTP cookie|cookies]] to track sessions, when the user logs out, session-only cookies from that site will usually be deleted from the user's computer. In addition, the server invalidates any associations with the session, thereby making any session-handle in the user's cookie store useless. This feature comes in handy if the user is using a [[public computer]] or a computer that is using a [[Wi-Fi hotspot|public wireless connection]]. As a security precaution, one should not rely on implicit means of logging out of a system, especially not on a public computer; instead, one should explicitly log out and wait for the confirmation that this request has taken place.
 
Logging out of a computer, when leaving it, is a common security practice preventing unauthorized users from tampering with it. There are also people who choose to have a password-protected [[screensaver]] set to activate after some period of inactivity, thereby requiring the user to re-enter his or her login credentials to unlock the screensaver and gain access to the system. There can be different methods of logging in that may be via image, fingerprints, [[Iris recognition|eye scan]], password (oral or textual input), etc.
 
==History and etymology==