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A three-digit HTTP number that summarizes what happened to a request.
200 means success, 301 or 302 means redirect, 400 means the request was bad, 401 means not logged in, 403 means not allowed, 404 means missing, and 500 means the server crashed or failed. Status codes are the fastest first clue in web debugging.
Plainly
Think of Status Code as a named building block in a big LEGO app. A three-digit HTTP number that summarizes what happened to 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.