A backsaw is a tool with a blade that is used to cut wood in a straight line. It has a handle that you hold onto and the blade is attached to it. It is called a backsaw because the back of the blade is reinforced with a piece of metal that keeps it straight and helps it cut accurately. The blade is thin and has small, sharp teeth that make it easy to cut through wood without damaging it. When you use a backsaw, you have to be careful and go slowly to make sure you are cutting in a straight line. Overall, it is a tool that helps people make precise cuts in wood.