The Security Assertion Markup Language (SAML) is an open standard that allows security credentials to be shared by multiple computers across a network. SAML 2.0 was introduced in 2005 and remains the current version of the standard. Many security vendors use SAML as the basis for their commercial offerings to ensure interoperability. A SAML assertion is the document by which all the information we’ve been discussing is transmitted from one computer to another. The most common one in practice is single sign-on (SSO) allows a user to log in once and access multiple services.”]
Source: https://www.csoonline.com/article/3232355/how-saml-works-and-enables-single-sign-on.html