A breadcrumb is a small text path, often located at the top of a page indicating where the user is on the site. This breadcrumb trail immediately shows you where you are. Every step of that path is clickable, all the way back to the homepage.
Breadcrumbs (or breadcrumb trail) is a secondary navigation system that shows a user's location in a site or web app. The term came from the Hansel and Gretel fairy tale in which the main characters create a trail of breadcrumbs in order to track back to their house.