PubNub is a real-time data streaming and messaging platform that allows developers to build and deploy scalable and reliable real-time applications. The platform provides APIs and infrastructure that enable developers to create applications that can transmit and receive data in real time across various devices, platforms, and networks.

PubNub provides a set of tools and services to enable real-time communication between devices, servers, and clients, including publish/subscribe messaging, presence detection, and history storage. The platform also offers various features like push notifications, secure data transfer, and cloud functions, which help developers to build interactive and responsive real-time applications.

PubNub is used by various industries, including gaming, healthcare, finance, and IoT. Developers can use PubNub to build real-time features such as live chat, live location tracking, real-time dashboards, and multi-player games, to name a few.