What is the difference between SSO and SAML?
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SAML is a a XML-based markup language for security assertion and SSO is an authentication scheme that allows user to login using LDAP in most cases,
SAML is an XML-based markup language for security assertions. Single sign-on is an authentication scheme that allows a user to log in by using LDAP databases on servers.
There are already some very good answers here. One point I didn't see made is that while you cannot "buy" SAML, you can buy a SSO solution based on the SAML standard.
SAML has more (program capable) features between the service provider and the identity provider.
SSO is an authentication scheme often accomplished by LDAP and SAML is a XML-based markup language for security assertion in the form of a token.