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              What is main difference error 404 &503?

The 404 error message is shown when a site or folder on a server are requested but cannot be found at the given URL. Please check your input.

The 503 service unavailable message means that the website origin server is not available and is usually a temporary state. This error could be triggered because something running on the website server side has crashed or your site is purposefully down for maintenance.

error  404 message is shown when a site or folder on a server are requested but cannot be found at the given URL.  and error 503 displays when web server is unable to handle HTTP request due to temporary overloading of the server.