Okta Universal Directory centralizes and manages user identities across hybrid IT environments by aggregating and synchronizing user data from multiple sources like Active Directory, LDAP directories, HR systems, and external applications into a unified repository. It supports unlimited users and customizable attributes, including sensitive data and linked objects, accessible via APIs or LDAP. The service integrates with over 6,500 pre-built applications in the Okta Integration Network for single sign-on, automated provisioning, and granular access control. Universal Directory operates alongside existing directories without requiring replacement, enabling centralized administration through a single console while maintaining legacy systems. It includes security features such as multi-factor authentication, risk-based authentication policies, and session risk evaluation post-login, while offering customizable schemas to adapt to organizational needs.