# Single Sign-On (SSO)

A system that lets users log in once to access multiple connected applications without re-entering credentials.

**Single sign-on (SSO)** is an authentication[↗](/authentication) system that lets a user log in once with one set of credentials to gain access to multiple connected applications and services, without having to log in separately to each one.

SSO improves both convenience and security: users manage fewer passwords, and organizations can enforce strong authentication and instantly revoke access across every connected app the moment an employee leaves, rather than chasing down dozens of separate accounts.