What is 301 and 404 error?
A 404 error implies that the requested URL may be available again in the future, but not necessarily with the same content. A 301 Moved Permanently redirect is used when a requested resource has been moved permanently to a new URL and any future references to this resource should use one of the returned URLs.
What is a 301 redirect page?
A 301 signals a permanent redirect from one URL to another, meaning all users that request an old URL will be automatically sent to a new URL. A 301 redirect passes all ranking power from the old URL to the new URL, and is most commonly used when a page has been permanently moved or removed from a website.