The admin toolbar is the dark bar that appears at the top of the screen when you are logged into Drupal as an administrator. It gives quick access to common tasks like content creation, configuration, and user management.
Out of the box, Drupal includes a basic toolbar. Most developers install the Admin Toolbar contrib module, which adds dropdown menus for faster navigation through the admin interface.
The toolbar can be themed or replaced entirely. Gin, for example, provides its own sleeker admin toolbar as part of its overall admin experience. Site builders can also restrict what appears in the toolbar based on user permissions, so editors see a simplified version while developers get the full menu. It is a small but important part of daily Drupal use.