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- it’s about the interaction between the user and the application or device,
- it’s about the interaction between multiple users through that device.
This means that ui design is about how a product works. It is about choosing the right tools for the job. Does a particular interface even need buttons? If so, what do those buttons need to do? What do you need to provide users with so that they can figure out how my application works and accomplish what they want to do with ease?