The origins of UI buttons go back to physical pushbuttons that first appeared on electronics and other gadgets. In digital products, buttons are one of the main interactive building blocks. They allow users to perform actions with a single click or tap — for example, Submit, Start, Create New, etc.

A button's role is to encourage users to act. Button labels are as important as their design. Use action verbs on button labels (like "Buy Now" or "Add to Cart") to tell users what the button does so they can act without reading supporting text.