GitHub has introduced a Command Bar feature that enhances the traditional search box with command line-like capabilities, allowing users to interact with github.com in a more efficient manner. By typing help into the Command Bar, users can access various functionalities such as viewing user profiles, navigating to repositories, listing repositories and issues, and searching open issues with specific terms. The Command Bar includes features like tab completion, smart filtering, and command history, accessible via the ↑ arrow key, mimicking terminal behavior. Users can quickly access the Command Bar by pressing s on any GitHub page, and GitHub plans to continue expanding its capabilities, with updates to be announced through blog posts.