> ## Documentation Index
> Fetch the complete documentation index at: https://docs.quickblox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Users

> The User module manages everything related to user accounts handling, authentication, account data, etc.

* **OAuth** (open-standard authorization protocol) is secure and supports transparent authentication within a secure user session.
* **Social login**. Logging in users with their Facebook/Firebase phone number accounts is available.
* **User tags**. Set up user tags and address them separately in your app or through the Dashboard. Tags can be added/deleted in the user’s profile.
* **Existing user base integration**. Our module supports connection to your system by storing your existent IDs table and matching them to new ones.