HTTP Status Code 301 refers to Moved Permanently. This code indicates that the requested resource has been permanently moved to a new URI. The response will include the new URL in the Location header, and future requests for the resource should use this new URL. Clients and user agents, including browsers, should update their bookmarks and links to reflect this new location. This status is essential for SEO purposes, as it helps search engines understand that the resource has a new permanent address.