Breadcrumbs are a navigational element of a webpage that helps the user understand where an individual page fits within the website's hierarchy. Breadcrumbs are usually located in a horizontal bar above the main content.
An example of breadcrumbs for this page would be:
The breadcrumb trail allows the user to easily click back to the pages sitting above the one they are on in the sites hierarchy.
Breadcrumb details can be added to your pages' SERP result with structured data markup that lets the major search engines know where the page sits within the site as a whole.
Find out ore about adding breadcrumb markup to your site.