What is a 404 error and why does it occur in Node.js?

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What is a 404 error and why does it occur in Node.js?
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A 404 error, or 'Not Found', indicates that the server cannot find the requested resource. In Node.js, this typically happens when a client (like a web browser) tries to access a URL that doesn't exist on the server or that has been moved or deleted. This can be due to incorrect URL parameters, misconfigurations, or server-side issues.