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Browser rules that control which websites can read responses from another origin.
CORS is enforced by browsers, not by curl or server-to-server calls. Misconfigured CORS can block legitimate frontend apps or expose APIs too widely.
Plainly
Think of CORS as roads and power for the app city. Browser rules that control which websites can read responses from another origin.
In practice
Use it when local behavior needs to become a reachable, reliable deployed service. In practice, define the owner, input, output, and failure mode before you rely on it.