Ball end mills are specialized cutting tools used in milling machines to create rounded shapes and contours in materials like metal, wood, and plastic. They feature a spherical end that allows for smooth, curved cuts, making them ideal for tasks such as creating molds or intricate designs. These tools come in various sizes and are often made from high-speed steel or carbide for durability. Ball end mills can be used in both CNC (Computer Numerical Control) machining and manual milling processes, providing versatility for different applications in manufacturing and fabrication.