This makes single sign-on technology possible by providing a way to authenticate a user once and then communicate that authentication to multiple applications. The most current version of SAML is SAML 2.0.
SAML technology is like an identity card. "a short, standardized way to show who someone is. rather than, say, conducting a series of DNA tests to confirm someone's identity, it is possible to just glance at their ID card.
Authentication: Determining that the users are who they claim to be
Authorization: Determining if users have the right to access certain systems or content