A ratchet screwdriver is a versatile hand tool designed for driving screws efficiently. It features a mechanism that allows the user to turn the handle in one direction while the bit remains stationary in the opposite direction. This design enables quick and continuous screwing without the need to reposition the tool after each turn. Most ratchet screwdrivers come with interchangeable bits, making them suitable for various screw types and sizes. They are commonly used in construction, electronics, and home improvement projects, providing convenience and reducing hand fatigue during repetitive tasks.