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In computer security, a login or logon (also called logging in or on and signing in or on) is the process by which individual access to a computer system is controlled by identifying and authentifying the user referring to credentials presented by the user.
A user can log in to a system to obtain access and can then log out or log off (perform a logout / logoff) when the access is no longer needed. To log out is to close off one's access to a computer system after having previously logged in.
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