With JRedirects every time that you change a menu or article alias or you change the structure of menu items, the old links are automatically mapped to the new ones under the hood.
There are no actions required on your part, the plugin will work seamlessly to redirect automatically users and search engines to new links.
Doing HTTP 301 redirects is the most efficient and Search Engine Friendly method for webpage redirection to preserve your search engine rankings and Seo Juice assigned to your website pages.
It also has the additional benefit of preventing people from getting on “Page not Found” errors when they follow old links to pages on your site. They’re gracefully and automatically redirected to the appropriate new page on the site and optionally prompted to update their bookmarks.
MORE INFO