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A user interface (UI) is the point of interaction and communication between a human and a computer, application, or device. It includes all the visual and interactive elements, such as screens, buttons, icons, keyboards, and mice, that allow a user to control a system and receive feedback. A well-designed UI is intuitive, efficient, and user-friendly, making it easier for users to achieve their goals with minimum effort.

Components: A UI consists of all the elements a user sees and interacts with, such as display screens, buttons, icons, menus, and forms. It also includes input devices like keyboards, mice, and touchscreens, as well as output devices like speakers and monitors.

Purpose: The primary goal of a UI is to allow users to effectively control a device or software and to provide feedback on the results of their actions.

Design: UI design focuses on creating an intuitive and seamless bridge between the user's goals and the technology, incorporating factors like layout, color, and typography.

Examples: Examples of UIs range from the physical buttons on a remote control to the graphical elements on a smartphone's home screen, or the text-based commands in a command-line interface.