A "Breadcrumb Trail" is a navigational aid used in websites and applications to help users understand their location within a hierarchy. It typically appears as a series of links at the top of a page, showing the path taken to reach the current page. This feature enhances user experience by allowing easy backtracking to previous sections, making navigation more intuitive. The term originates from the fairy tale of Hansel and Gretel, where the characters leave a trail of breadcrumbs to find their way back home. In digital contexts, breadcrumb trails improve usability and can also contribute to better SEO by providing search engines with a clear structure of the site.