Once upon a time, when you searched the Web at Google, the results displayed were limited to a list of 10 pages with page title, snippet of text from meta description or page content, and URL to that page. We’ve been seeing the search engines diversifying what they might display for certain pages, with special formats for things like forum posts, Q&A listings, pages that include events, and sometimes sitelinks or quicklinks to other pages as well.
The URL shown for some pages might have hinted at the structure of sites and locations of pages within a site hierarchy, if they showed directories and subdirectories within paths to pages. Some websites include breadcrumb navigation on their pages to show you more explicitly where you might be at within a site, and provide an easy way to visit higher categories. Google has started showing those breadcrumb listings for some pages, to make those listings more useful for searchers, and to make it more clear where those pages are within the hierarchy of a site.