UI Testing is a process used to evaluate the user interface of a software application. It ensures that the interface is visually appealing, functional, and user-friendly. Testers check elements like buttons, menus, and forms to confirm they work as intended and provide a good user experience. This type of testing can be performed manually or through automated tools. Manual testing involves human testers interacting with the application, while automated testing uses scripts to simulate user actions. Both methods help identify issues that could affect usability, ensuring that the final product meets user expectations and requirements.