In computer security, logging in (or logging on, signing in, or signing on) is the process by which an individual gains access to a computer system by identifying and authenticating themselves. The user credentials are typically some form of "username" and a matching "password", and these credentials themselves are sometimes referred to as a login (or a logon or a sign-in or a sign-on). In practice, modern secure systems often require a second factor such as email or SMS confirmation for extra security. When access is no longer needed, the user can log out (log off, sign out or sign off).
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