Why exactly do you need redirects?

Forwarding URLs is a cornerstone of search engine optimization. Especially during a relaunch (complete rebuilding of the shop) it is important not to lose the hard-won ranking. To avoid this, via a redirect Google is informed that information continues to exist and is now stored under a new URL. The PageRank is thus retained and passed on to the new page. There are two types of forwarding: A 301 (Moved Permanently) redirection indicates that the information is constantly to be found at a new address. A 302 (Moved Temporarily) redirection indicates that the landing page has been changed temporarily. However, the original URL should not be replaced. This method can be used e.g. for advertising campaigns. Thus, a well ranked page can refer to a special promotion page for a short time without losing value itself.