This is also known as a permanent redirect. You can use a 301 redirect to direct your visitor to the new page or site that you’ve moved permanently.
This is to tell Google or other search engines that your original page is no longer valid and in use and would like them to de-index it so that they can pass all the link juice to your newly redirected page or site.
A 301 redirect is extremely useful when you want ensure that anyone that has bookmarked your old web address will automatically be directed to the new one.
