# User API API Reference for User > **Terminology Update:** We have streamlined our naming conventions to improve clarity. The term **User** has been replaced with **User**. To avoid breaking changes the APIs still make use of the old term. Both terms refer to the same underlying functionality. [Overview](/content/docs/apis/introduction/index.html) Explore ZITADEL's APIs for authentication and authorization. Integrate identity management using OpenID Connect, OAuth 2.0, and SAML standards. [Add a Key](/content/docs/reference/api/user/zitadel.user.v2.UserService.AddKey) Add a Key: Add a keys that can be used to securely authenticate at the Zitadel APIs using JWT profile authentication using short-lived tokens. Make sure you store the returned key safely, as you won't be able... Zitadel AI Assistant Hey there, Iā€™m the Zitadel AI assistant šŸ¤– ā€” throw your questions my way! AI answers can be wrong. Please don't share secrets, credentials or personal data. Need Help?