> ## 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.

# Push Notifications

> Push Notifications module provides powerful and simple to use API to subscribe your users to push & email notifications and send them.

* **Offline messages**. Send a chat message when a recipient is offline.
* **Offline calls**. Make a video/audio call with offline opponents.
* **Requests to contact list.** Send requests to add a user to the contact list.
* **Messages Queue**. Notifications can be sent either instantly or assigned a specific time/date and pushed into a Message Queue allowing to send delayed and recurring messages such as planned marketing announcements or any planned notifications for the better engagement of the users.
* **Recurring notifications**. Set up a time interval and the message will be repeated automatically by the server.
* **User tags**. Send notifications to specific user groups defined by tags.