A hole saw is a cylindrical cutting tool used to create round holes in various materials like wood, metal, and plastic. It consists of a saw blade attached to a central drill bit, allowing it to cut through surfaces efficiently. Hole saws come in different sizes, making them versatile for tasks such as installing plumbing fixtures or electrical outlets. Using a hole saw is straightforward. You attach it to a power drill, position it where you want the hole, and start drilling. As the saw cuts, it removes a circular piece of material, known as a core, leaving a clean hole behind. This tool is popular among DIY enthusiasts and professionals alike.