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The message a server sends back after it handles a request.
A response includes a status code, headers, and a body such as HTML, JSON, a file, or an error message. A good response tells the client what happened and what to do next. If the UI shows the wrong thing, check the response body before blaming the frontend.
Plainly
Think of Response as a named building block in a big LEGO app. The message a server sends back after it handles a request.
In practice
Use it when you are mapping how the app is structured or explaining a feature to a teammate or agent. In practice, define the owner, input, output, and failure mode before you rely on it.