A federated identity system allows multiple software systems to access identity information from a centralized source. This system enables users to log in using their existing accounts. In an enterprise setting, a federated identity system enables branch offices to manage their own identity systems, while connecting these systems to a centralized source at the head office. This allows employees to access computer systems at different branches, though differing access policies may still be in place.
The Cryptography, Data Protection and Identity Security Center of Excellence