A circular saw is a very useful type of electric saw. It has a handle with on/off trigger switch, an arbor nut to hold the blade in place, and guards to protect the operator from touching the spinning blade. It is versatile as it can be moved to a table or bench and it is not affixed. A circular saw is a handheld power tool that turns a round flat blade to make a variety of cuts in wood, metal, or plastic depending on the blade selected. It is a good idea to read up about the different types of power saws before you buy one, depending on the material you need to cut into. There are two types of circular saw: battery-operated saws and mains-operated saws. If you choose a battery operated saw then you don't need to worry about extension leads getting in the way, while the mains operated saw lets you get on with the task without having to buy batteries. Select the type of saw that best suits your construction and home improvement projects.