Login

Logging out may be performed when the user takes an action, such as entering an appropriate command or clicking on an external link.

In addition, the server invalidates any associations with the session, thereby making any session-handle in the user's cookie store useless.

Logging out of a computer, when leaving it, is a common security practice preventing unauthorized users from tampering with it.

While there is no agreed difference in meaning between the terms login, logon and sign-in, different technical communities tend to prefer one over another – Unix, Novell, Linux, and Apple typically use login, and Apple's style guide says "Users log in to a file server (not log on to)...".

[3] By contrast, Microsoft's style guides traditionally suggested the opposite and prescribed log on and logon.