What is the term for a round edge on a part or face within a design?

The term for a round edge on a part or face within a design is known as a fillet. A fillet is a significant feature in design and engineering, used to create a smooth transition between two intersecting surfaces. It helps in reducing stress concentrations, improving aesthetics, and allowing easier assembly and manufacturing processes. By rounding the edges, fillets can help prevent sharp edges that may be prone to wear, chipping, or injuries while handling the object.

In contrast, other terms listed such as drive joint, extend, and exploded view refer to different concepts in design. A drive joint relates to a connection mechanism in machinery, extend refers to lengthening or increasing the size or reach of an object, and an exploded view is a technique used in technical drawings to show the parts of an assembly spread out but still related in one view. None of these terms involve the specific function of rounding corners like a fillet does.