A schema.org structured-data type that describes a hierarchical breadcrumb trail for a page. Marked up as JSON-LD or microdata, with each
ListItem giving its position and the URL/name of the ancestor page. When detected, Google replaces the URL in the SERP with the breadcrumb trail (e.g. example.com › books › fiction), giving searchers a clearer sense of where the result sits in the site. Always pair with visible HTML breadcrumbs that match the structured data, or the rich result may be filtered out as misleading.