What is the difference between a 401 and a 403 error?

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Grade: Education Subject: Support
What is the difference between a 401 and a 403 error?
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A 401 Unauthorized error means authentication is required. The server is telling you to provide credentials (username and password). A 403 Forbidden error means you've already authenticated, but you don't have permission to access the resource. The server knows who you are, but you're not allowed.