PubNub is a platform that facilitates real-time data streaming and device signaling by establishing persistent socket connections with various devices, ensuring data is pushed globally in under 100 milliseconds. Utilizing the Publish/Subscribe model, PubNub supports protocols like WebSockets and WebRTC Data Channel, making it ideal for applications requiring rapid data updates. It is particularly beneficial for streaming financial data, providing live location updates for maps in apps like ride-sharing, managing high-volume data streams through a 'firehose', turning smartphones into remote controls for various smart devices, and ensuring smooth multiplayer gaming experiences by delivering actions and commands swiftly to maintain synchronization among players.