Hardware interface design is all about creating the design of how people can interact with physical devices like computers, phones and tablets. It involves things like making sure the buttons are easy to press, where the buttons should be placed, and how the device should look. Consider the way a remote control looks - the buttons have different shapes and sizes so you know what to press quickly and correctly when you're using it. Designers need to think carefully about how people will interact with the device to make sure it is user-friendly.