301 redirects are permanent redirects that tell the search engine and the users that a certain website has been permanently changed to another website, which can be referred to as the destination page. What happens after that is that the destination page is given the control or authority. Initially, people thought that 301 HTTP redirects benefit their website and seo performance by a large margin. However, in 2016, data analysts at google publicly announced that, while 301 redirects may not particularly harm seo performance, they might not boost it much either. These redirects can be useful when a website needs to be changed to a new URL. For engines like Bing, these redirects can be useful but nobody uses that anymore.