User Interface (UI) refers to the visual and interactive elements that allow users to interact with a digital device, software application, or system. This includes all the components that make up the front end of a product, such as buttons, menus, icons, text, images, and input fields. The UI is designed to be intuitive and user-friendly, ensuring that users can easily navigate, input information, and receive feedback from the system. It plays a critical role in the overall user experience, as it directly influences how effectively and efficiently users can accomplish their tasks.