logoff

Logoff, or log off, is the process of terminating an active user session on a computer system, service, or network. It typically ends the current authentication session, releases resources associated with the user, and returns the system to a state where another user can authenticate.

Logoff can apply to local operating systems, network services, and web applications. It is distinct from simply disconnecting a remote session, which may leave applications running on the host; a logoff ends the session context and closes the user's processes.

A successful logoff usually clears in‑memory credentials, invalidates tokens, and resets session‑specific data. On a web service, logging off generally invalidates the session cookie or token so the user must authenticate again to regain access. Some systems may preserve certain user preferences or application states for the next sign‑in.

Terminology varies by platform. Logoff is often used interchangeably with log out or sign out, though some environments reserve log off for ending a local session and use log out or sign out for remote or web sessions. Disconnect is a related term used for terminating a network connection without fully ending the host session.

Best practices include logging off on shared or public computers to prevent unauthorized use, or using a device lock if a full logoff is not possible. If automatic session timeouts are available, enabling them can reduce risk. In web applications, use the provided log out option to ensure server‑side session invalidation.

Platform notes: Windows uses Log off to end a user session; macOS uses Log Out to terminate the user session; Linux desktop environments provide similar options, while many Linux servers rely on shell commands like exit or logout for non‑graphical sessions. Web and mobile apps implement logoff in various ways through session management.