A twist drill is a type of cutting tool used primarily for drilling holes in various materials, including metal, wood, and plastic. It features a cylindrical shape with a pointed tip and spiral flutes that help remove debris from the hole as it drills. The design allows for efficient cutting and precise hole creation. Twist drills come in various sizes and materials, such as high-speed steel or carbide, to suit different applications. They are commonly used in conjunction with power tools like drills and drill presses, making them essential for both professional and DIY projects in fields like construction and manufacturing.