CORS is a browser rule that controls which origins can read responses from your API via JavaScript. It’s not authentication and it doesn’t stop someone from calling your API from a server or tools like curl. You still need proper auth/authz and input validation on the server.
Expanding on the short answer — what usually matters in practice:
A tiny example (an explanation template):
// Example: discuss trade-offs for "cors:-what-is-it-and-what-does-it-not-protect-yo"
function explain() {
// Start from the core idea:
// CORS is a browser rule that controls which origins can read responses from your API via Ja
}