WebRTC basics

Summary

Web Real-Time Communication — a browser API enabling peer-to-peer audio, video and data streaming directly between browsers, without routing through a server. WebRTC handles real-time media and data, but connection setup still requires signaling and often NAT traversal infrastructure such as STUN/TURN services.

• 1Try a simple WebRTC demo to see a peer-to-peer video call work. Inspect the result in DevTools or the console and explain what you observed.
• 2Learn the three core pieces: MediaStream, RTCPeerConnection, RTCDataChannel. Focus on understanding the underlying reason it works, not only memorizing the definition.
• 3Understand why signaling servers are still needed even though media flows peer-to-peer.