The document discusses WebRTC, a technology that enables real-time communication via web browsers. It provides three demos including a p2p connection demo and video call demo. It explains key WebRTC APIs like MediaStream, RTCPeerConnection, and RTCDataChannel. It also discusses signaling protocols, STUN/TURN servers, and the overall WebRTC architecture. The document aims to explain how WebRTC works and whether it is ready for use.