This is SEO for Google to display breadcrumbs in the search results. This allows the search result to search as multiple links.

Resources

• https://developers.google.com/search/docs/data-types/breadcrumbs
• https://json-ld.org/
• https://search.google.com/test/rich-results
• https://search.google.com/structured-data/testing-tool

Rendered example inside a <script type="application/ld+json">:

{
  "@context": "https://schema.org",
  "@type": "BreadcrumbList",
  "itemListElement": [{
    "@type": "ListItem",
    "item": "https://bernheisel.com/blog",
    "name": "Posts",
    "position": 1
  },{
    "@type": "ListItem",
    "item": "https://bernheisel.com/blog/nostalgia-programming",
    "name": "Nostalgia, Fun, and Programming",
    "position": 2
  }]
}