What does identity federation enable users to do?

Identity federation enables users to access resources across different domains and platforms using a single identity, which streamlines the user experience and enhances convenience. This is achieved through protocols and standards that allow disparate identity providers to share authentication and authorization information. Essentially, when a user logs into one domain, they can seamlessly access resources in another without needing to establish separate credentials for each one. This approach not only simplifies the authentication process but also improves productivity for users, who can navigate multiple applications and services without repetitive logins.

The other options pertain to identity management and security practices but don't directly describe the core function of identity federation. While multi-factor authentication can indeed enhance security, it’s not specific to the concept of identity federation. Reducing login times and centralizing password management are benefits commonly referenced within integrated identity management systems, but they do not encapsulate what identity federation specifically enables in terms of cross-domain access.