What is HTTP errors in SEO?

404 - Responds with an error, but shows a custom page to help your visitors.
200 - If a page is missing, it's replaced with the custom error page.
302 - If the page is missing, it's replaced with a temporary redirect to a custom error page.
301 - Redirects errors to either a custom error page, or some other page in the site.
403 is HTTP error. The request requires user authentication.
These type of errors 400, 401 - 404, 501 - 503, etc are supposed to be the HTTP status codes.
 
When you click on a link or type in a URL and see error 404, it means the page cannot be found. This usually indicates that either the content has been deleted or the link was typed in incorrectly.

This can make a bad experience for those visiting your site. If a user encounters a lot of broken links, they can easily get impatient and start searching elsewhere.
 
Status codes are issued by a server in response to a client's request made to the server. It includes codes from IETF Request for Comments (RFCs), other specifications, and some additional codes used in some common applications of the Hypertext Transfer Protocol (HTTP).
 
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