Full-Duplex

A communication mode where data flows simultaneously in both directions between two endpoints without taking turns. WebSocket connections are full-duplex — the server can push messages to the client at any time while the client simultaneously streams data to the server. gRPC bidirectional streaming and SIP voice sessions are also full-duplex. Full-duplex communication eliminates head-of-line blocking inherent in half-duplex request-response cycles, enabling real-time applications like chat, gaming, and live telemetry.