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Definition
SSO is an authentication method that allows a user to log in once and gain access to multiple applications or systems without needing to sign in separately to each one. It works by establishing a trusted session through a central identity provider that other connected services recognize.

Why it matters
SSO improves both user experience and security by reducing password fatigue and the risk of weak or reused credentials across platforms. For organizations, it simplifies access management and makes it easier to enforce consistent authentication policies, including multi-factor authentication, across all connected tools.

Example use case
An employee logs into their company’s SSO portal in the morning using a single set of credentials. For the rest of the day, they can access their email, project management tool, HR platform, and internal dashboards without being prompted to log in again, as each application recognizes the active session.