"What’s That Course?" is a Chrome extension designed to simplify the process of looking up Cornell University course titles. Users can highlight course codes on any webpage, and the extension will provide instant access to the corresponding course titles, eliminating the need for manual searches or tab switching. The tool integrates into the browser's context menu, allowing users to right-click on selected codes or use a popup for manual entry.

Additionally, the extension offers a feature to automatically highlight all course codes on a webpage with the click of a button. This functionality enhances user experience by making it easier to locate course information on platforms like Ed Discussion and Reddit. Overall, "What’s That Course?" is a practical tool for streamlining academic planning and accessing crucial course details quickly.