User interface design or user interface engineering is the design of computers, gadgets, appliances, machines, mobile communication devices, software applications, and websites with the focus on the user's experience and interaction.
Unlike traditional design where the goal is to make the object or application physically attractive, the goal of user interface design is to make the user's interaction experience as simple and intuitive as possible - what is often called user-centered design.
Where good graphic/industrial design is bold and eye catching, good user interface design is often subtle and invisible.
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