There are many types of a saw in the world. Hand saws typically have a relatively thick blade to make them stiff enough to cut through the material. Thin-bladed handsaws are made stiff enough either by holding them in tension in a frame or by backing them with a folded strip of steel (formerly iron) or brass (on account of which the latter are called "backsaws.") Some examples of hand saws are:   

Artillery saw, Chain saw, Portable link saw: a flexible chain saw up to four feet long, supplied to the military for clearing tree branches for gun sighting;

Butcher's saw: for cutting bone; many different designs were common, including a large one for two men, known in the USA as a beef-splitter; most were frame saws, some backsaw

Crosscut saw: for cutting wood perpendicular to the grain

• Docking saw: a large, heavy saw with an unbreakable metal handle of unique pattern, used for rough work.