A user interface (UI) is the point of interaction between a person and a computer or device. It includes everything a user sees and interacts with, such as buttons, menus, and icons. A well-designed UI makes it easy for users to navigate and accomplish tasks without confusion. For example, when using a smartphone, the layout of the home screen and the arrangement of apps are crucial for a smooth experience. User interfaces can be found in various forms, including websites, mobile applications, and software programs. Designers focus on creating intuitive UIs that enhance usability and accessibility. Good UI design considers the needs of users, ensuring that they can find what they need quickly and efficiently.