An effective visual aid that indicates the location of the user within the website’s hierarchy, making it a great source of contextual information for landing pages.

Breadcrumb Navigation Examined: Best Practices & ExamplesHongkiat
Breadcrumb Navigation Increasingly UsefulNielsen Norman Group
Breadcrumbs In Web Design: Examples And Best PracticesSmashing Magazine
When You Should Use a Breadcrumb NavigationUX Movement
Breadcrumb Navigation: Good for Website Usability or Not?Usabilia