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What is SSO?
Single sign-on (SSO) is a centralized session and user authentication service in which one set of login credentials can be used to access multiple applications. Its beauty is in its simplicity; the service authenticates you on one designated platform, enabling you to then use a variety of services without having to log in and out each time.
In the most common arrangement, the identity provider and service provider establish a trust relationship by exchanging digital certificates and metadata, and communicate with one another via open standards such as Security Assertion Markup Language (SAML), OAuth, or OpenID.