A redirect 301 is a permanent redirect from one old URL to another existing page. Through using the redirect 301 feature you can retain the SEO ranking of your old URL.
Exai makes it easy to redirect a URL by selecting Page Settings and entering the URL you want redirected in the redirect 301 field. You can enter more than one URL. If you make changes to a page, then you need to copy and paste the old path into the redirect 301 including the http:// and your domain name. This way the old page that no longer exists will link to the existing page through the path of the url.