Instead of hitting the "Back" button to leave your site, users can easily click "up" to a parent category to find more content.
They provide a "quiet, invisible" way to guide users without cluttering the interface. breadcrumb
In web design, breadcrumbs are a secondary navigation aid that shows users their current location within a website's hierarchy. They typically appear as a horizontal trail of clickable links at the top of a page, such as: Home > Blog > Web Design > How to Use Breadcrumbs . Why Your Blog Needs Them Instead of hitting the "Back" button to leave
Every part of the trail should be a link, except for the current page title. except for the current page title.