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The message a browser, app, or agent sends to a server.
A request usually includes a method (GET, POST), a URL, headers, and sometimes a JSON body. Example: a signup form sends a POST request with an email address. When debugging, inspect what was actually sent, not what you expected the code to send.
Plainly
Think of Request as a named building block in a big LEGO app. The message a browser, app, or agent sends to a server.
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.