• A computer communications protocol, providing full-duplex communication channels over a single TCP connection. The WebSocket protocol was standardized by the IETF as RFC 6455 in 2011, and the WebSocket API in Web IDL is being standardized by the World Wide Web Consortium (W3C). WebSocket is distinct from HTTP, although both protocols are located at layer 7 in the OSI model and depend on TCP at layer 4. The WebSocket protocol enables interaction between a web browser (or other client application) and a web server with lower overhead than half-duplex alternatives such as HTTP polling, facilitating real-time data transfer from and to the server. ← Wikipedia

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