A breadcrumb is a small text path, often located at the top of a page indicating the user's location on a website. Every step of this path is clickable, all the way back to the homepage. This term comes from the Hansel and Gretel tale in which the two title children drop breadcrumbs to form a trail back to their home. These breadcrumbs ultimately became the model currently used on websites these days.
Enriched with structured data, Google may show the breadcrumbs in the SERP, improving the visibility of your site within GoogleBack