A power tool is a device that uses an external power source, such as electricity, batteries, or compressed air, to perform tasks more efficiently than manual tools. Common examples include drills, saws, and sanders. These tools are designed to make construction, woodworking, and other tasks easier and faster, often resulting in more precise work. Power tools come in various types, each suited for specific applications. For instance, a cordless drill is ideal for drilling holes in various materials, while a circular saw is used for cutting wood. Safety features, such as guards and automatic shut-off, are essential to prevent accidents during use.