Circular saws are a type of power tool that are commonly used for cutting wood and other materials. They consist of a circular blade that spins rapidly and is powered by an electric motor. The Saws come in a variety of sizes and styles, and are typically classified based on the diameter of their blades. Common blade sizes include 7-1/4 inch, 8-1/4 inch, and 10 inch. They can be corded or cordless, and some models are designed to be used with specialized blades for cutting metal, tile, or other materials. However, they can also be dangerous if not used properly, so it's important to follow safety guidelines and wear protective gear when using a circular saw.