Definition: A 301 redirect is a permanent server-side redirect that automatically sends visitors from one URL to another, typically used when a webpage has been moved or deleted. It also ensures that search engines update their index to replace the old URL with the new one, thereby preserving the page’s search engine ranking. The “301” code is an HTTP status code indicating that the move is permanent, as opposed to other types of redirects which might be temporary. Utilizing a 301 redirect is crucial for maintaining a website’s SEO value when changing the URL structure or migrating to a new domain.