A drill bit is a cutting tool used to create cylindrical holes in various materials, such as wood, metal, or plastic. It is attached to a power tool called a drill, which rotates the bit to perform the cutting action. Drill bits come in various shapes and sizes, each designed for specific tasks, such as making pilot holes or enlarging existing holes. Different types of drill bits include twist bits, spade bits, and hole saws, each suited for particular applications. The material of the drill bit can also vary, with options like high-speed steel or carbide, which affect durability and performance.