Lolz, nihan its not use in Linux but Breadcrumbs can be define as a SEO strategy use in mostly websites and blogs to make user friendly links. Breadcrumbs or breadcrumb is a navigation used in user interface, typically appear horizontally across the top of a web page, usually below title bars or headers in blog area. It contains categories or labels use in a website for specific posts or topic. You can check and see Breadcrumbs into my blog under any post title.
Breadcrumbs displays the page hierarchy. Also helps quick navigation. For seo it helps with internal linking.