What is the primary purpose of SAML 2.0?

The primary purpose of SAML 2.0 (Security Assertion Markup Language) is to exchange authentication and authorization data between an identity provider and a service provider. SAML enables single sign-on (SSO) capabilities, which allows users to authenticate their identity once and gain access to multiple applications without needing to log in each time. This streamlined workflow is essential in enhancing user experience, especially in environments where users interact with various services that require different credentials.

Implementing SAML allows for federated identity, meaning that identity management can be centralized in one location (the identity provider), while allowing external services to authenticate users' identities without storing sensitive credentials elsewhere. This adds a layer of security and efficient access management.

In contrast, the other options do not align with the core functionalities of SAML 2.0. Enhancing encryption methods pertains more to cryptographic protocols rather than identity assertion. Providing user training is a matter of human resources and involves instructional content, not the technical framework that SAML represents. Managing local user databases focuses on the administration of user information on a specific server or application, which is outside the scope of SAML's purpose as a mechanism for data interchange regarding authentication and authorization.