A round hole is a type of opening or receptacle that is circular in shape and has no corners. It can refer to any kind of hole, such as one drilled into a piece of wood, metal or plastic, but it usually implies an opening with specific dimensions designed for a particular purpose. For example, the term "round hole" might be used when referring to the size and shape of a screw, bolt or other fastener that requires a circular-shaped depression in order to fit properly into place. In this context, it means having an exact match between the shape of the opening and the object being inserted into it.