Breadcrumb trails on a page indicate the page's position in the site hierarchy. A user can navigate all the way up in the site hierarchy, one level at a time, by starting from the last breadcrumb in the breadcrumb trail.

In the example below, the page thestand.html about a specific book may contain the following breadcrumb trail:

Home › Books › Authors › Stephen King › The Stand

The last item in the breadcrumb trail - "The Stand" - leads to the page itself. The breadcrumb before that - "Stephen King" - leads to its parent page. The "Authors" breadcrumb leads two levels up the site hierarchy.

The breadcrumb trail may include or omit a breadcrumb for the page on which it appears. The following would also be a valid breadcrumb trail for thestand.html:

Home › Books › Authors › Stephen King

Pages may contain more than one breadcrumb trail if there is more than one way of representing a page's location in the site hierarchy. The page thestand.html may, for instance, additionally contain the following breadcrumb:

Books › Fiction › Horror › The Stand

When you mark up breadcrumb information in the body of a web page, Google can use it to understand and present the information on your pages in our search results, like this:

image of a Google search result showing breadcrumbs


Source: Google.com