App Context is a serverless storage solution provided by PubNub that allows developers to store and manage user, channel, and device metadata without the need for additional backend infrastructure. By offering scalable storage and management capabilities for metadata and channel memberships, App Context enables developers to build real-time applications efficiently while focusing on enhancing the end-user experience rather than infrastructure maintenance. This includes features such as setting, removing, and accessing metadata, as well as managing channel memberships and receiving real-time data events when changes occur. Developers can easily start using App Context by enabling it through the PubNub Admin Dashboard, streamlining the process of integrating it into their applications.