A JSON-LD block that describes a page's place in the site hierarchy.
BreadcrumbList is small, cheap, and high-leverage. It tells retrievers the canonical taxonomy — Home > Collection > Product — which lets them cite a PDP as belonging to a broader collection.
Ship it on every non-root page. The itemListElement array should mirror the visible breadcrumb UI exactly, with Position starting at 1.
JavaScript Object Notation for Linked Data — the recommended wire format for Schema.org markup.
A shared vocabulary maintained by Google, Microsoft, Yahoo, and Yandex for describing entities on the web.
Any markup that describes page content in a machine-readable format — most commonly JSON-LD using Schema.org types.