A cordless screwdriver is a portable power tool designed for driving screws and fasteners without the need for a power outlet. It operates on a rechargeable battery, making it convenient for use in various locations, such as homes and construction sites. The tool typically features a rotating head that can be adjusted for different torque settings, allowing users to control the force applied to screws. These screwdrivers come in various sizes and designs, often including features like LED lights for visibility in dark areas and ergonomic grips for comfort. They are commonly used in DIY projects, furniture assembly, and repairs, making tasks quicker and easier compared to manual screwdrivers.