Identity Federation is a system that allows users to access multiple applications or services using a single set of login credentials. This means that instead of remembering different usernames and passwords for each service, users can authenticate once and gain access to various platforms seamlessly. This is particularly useful for organizations that use multiple software solutions. In an Identity Federation setup, different organizations or services trust each other to verify user identities. This is often achieved through standards like SAML (Security Assertion Markup Language) or OAuth. By establishing these trust relationships, users can move between services without needing to log in repeatedly, enhancing both security and convenience.