In Drupal, it shows the hierarchy of the page that the user is currently viewing.

Breadcrumbs is a navigational aid which allows a user to realize the position of the current page in regards with the site hierarchy.

Drupal uses the active-menu-trail to calculate the breadcrumb which may be presented by the current theme. There is a theme variable setting which controls whether the breadcrumb is displayed.

There are several ways to customize the breadcrumbs theming, including using drupal_set_breadcrumbs() in a custom theme or module, and there are plenty of contributed modules which affect the breadcrumb. This is very useful for sites that the breadcrumbs cannot be calculated in a straightforward manner from the menu items.

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