A User Interface is defined by Wikipedia as "is the aggregate of means by which people—the users—interact with the system—a particular machine, device, computer program or other complex tools. The user interface provides means of:
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* Input, allowing the users to manipulate a system
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* Output, allowing the system to produce the effects of the users' manipulation."
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So, the Sugar interface is the icons and words on the screen that you click on using the keyboard or mouse.