A cordless screwdriver is a portable power tool designed for driving screws and fastening materials without the need for a power outlet. It operates on a rechargeable battery, making it convenient for use in various locations, including tight spaces and outdoor projects. The tool typically features a rotating head that can be adjusted for different screw sizes and types. These screwdrivers come with various torque settings, allowing users to control the amount of force applied when driving screws. Many models also include a built-in LED light for improved visibility in dark areas. Overall, a cordless screwdriver is an essential tool for DIY enthusiasts and professionals alike.