SAML (Security Assertion Markup Language) is an XML-based standard used for exchanging authentication and authorization data between parties. It is commonly used for implementing single sign-on (SSO) and identity federation across different organizations or service providers. SAML enables secure and seamless access to applications and resources without the need for multiple logins. The standard is widely adopted in enterprise environments for managing user identities and roles. SAML is designed to ensure interoperability between systems while maintaining high levels of security.