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A 301 redirect is a method of telling web browsers and search engines that a web page or site has been permanently moved to a new domain name (URL). In doing so, search engines will quickly change their indices and, in theory, preserve the search engine rankings that the site had at the previous domain.
When we implement 301 redirect, the search engine passes the entire value of the old URL to the new URL like: backlinks value, page rank, domain authority, page authority.
Web browsers will typically follow 301 redirects to the new location automatically, without the need for user action.
It can either be implemented through .htaccess rule or page to page mapping.