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WebSocket is an API or networking concept that helps apps send requests, receive responses, and move data between systems.
WebSocket matters because API bugs are often contract, status, header, authentication, or network-boundary bugs rather than UI bugs. It gives builders a precise word for the thing they are changing, debugging, reviewing, or shipping.
Plainly
Think of WebSocket as a message rule for how apps talk to each other. It gives one small job a clear name so the whole app is easier to understand.
In practice
Use it when a browser, backend, agent, payment provider, or external tool needs to exchange data reliably. In practice, name the owner, input, output, failure mode, and proof before relying on WebSocket.