A circular saw is a power tool that uses a toothed or abrasive disc to cut through various materials, such as wood, metal, or plastic. It operates by spinning the blade at high speeds, allowing for quick and efficient cutting. Circular saws are commonly used in construction and woodworking, making them essential for both professionals and DIY enthusiasts. These saws come in different sizes and types, including cordless circular saws for portability and table saws for more precise cuts. Safety features, such as blade guards and electric brakes, are important to prevent accidents while using this powerful tool.