An impact driver is a power tool designed to drive screws and fasteners with high torque. It combines rotational motion with concussive blows, making it effective for tough materials like wood and metal. Unlike a standard drill, an impact driver can handle larger screws and bolts without stripping them, thanks to its unique mechanism. These tools are commonly used in construction, woodworking, and automotive applications. They typically feature a hex chuck that allows for quick bit changes, and many models are cordless, providing greater mobility. Popular brands include DeWalt, Makita, and Milwaukee.