Use 301 redirects exclusively for permanent website moves or URL changes. When you implement a 301 redirect, it tells search engines that the original URL has permanently moved to a new location. This is important because it helps preserve your site's search engine rankings by transferring ranking signals, such as PageRank and link equity, from the old URL to the new one. Without a proper 301 redirect, search engines may treat the new URL as a completely different page, potentially causing a loss in traffic and ranking. Using a 301 redirect ensures that both users and search engines are seamlessly directed to the correct page, maintaining your website's authority and providing a better user experience. Temporary redirects, like 302s, should not be used for permanent URL changes.