In computer security, login (logging or signing in, also log on)'s the process by which individual access to a computer system's controlled by identification of the user using credentials provided by the user. A user can log in to a system to obtain access, and then log out when the access's no longer needed. Note that the term log in (a verb)'s two words, while login (a noun or adjective referring to the procedure, credentials, or form used)'s one word; the same applies to log out and logout (… (More on Login)