Identity federation allows users to access multiple systems using a single set of credentials across trusted domains.
Security Assertion Markup Language (SAML) is an open standard for exchanging authentication and authorization data between parties, in particular, between an identity provider and a service provider.
Single Sign-On (SSO) is a property of access control of multiple related, yet independent, software systems. With this property, a user logs in once and gains access to all systems without being prompted to log in again at each of them.
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