What are 404 errors?
404 errors are considered one of the most potential impediments in the way to successful SEO. When a specific URL is renamed or becomes non-existent, any links connecting to that URL would result in 404 errors.
404 can occur as a result of configuration errors when ... a customized 404 error message rather than replacing
The 404 Not Found error, also called Error 404 or an HTTP 404 error, means that the web page you were trying to load was not found.
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The HTTP 404, 404 Not Found, 404, Page Not Found, or Server Not Found error message is a Hypertext Transfer Protocol standard response code, in computer network communications, to indicate that the browser was able to communicate with a given server, but the server could not find what was requested.
404 error page appears when a web page can't be found
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The 404 Not found, 404, is server not found error.
404 error are occurs when the website is not found.
The HTTP 404 Not Found Error means that the web page you were trying to reach could not be found on the server.
Its a website not found error.
A 404 error indicates that the server itself was found, but that the server was not able to retrieve the requested page.