URL redirects allow you to send users from a non-existing path on your site, to any other URL. You might want to use this to create a short link, or to transition users from an old URL that no longer exists to the new URL. Each site may only have a limited number of URL redirects.
A breadcrumb trail is a navigation aid used for web interfaces. It allows visitors to keep track of their locations within sections your site, displaying links above the main content region that lead back to the home page and to the parent pages of the current page.
i.e. Home / About / Contact