What are you referring to?

Navigational technique displaying all visited pages leading from the home page to the currently viewed page. All pages are linked for easy backwards navigation. Typically placed near the top of a web page.

Breadcrumbs typically appear horizontally across the top of a web page, usually below title bars or headers. They provide links back to each previous page the user navigated through to get to the current page or—in hierarchical site structures—the parent pages of the current one. Breadcrumbs provide a trail for the user to follow back to the starting or entry point. A greater-than sign (>) often serves as hierarchy separator, although designers may use other glyphs (such as » or ›), as well as various graphical treatments.
Typical breadcrumbs look like this:
Home page > Section page > Subsection page
or
Home page : Section page : Subsection page

Breadcrumbs is one of the methods of navigation. It include what Paddy has said.