A saw is a tool used to cut or saw wood or other items to be processed. The saw blade and saw body are composed of irregularly arranged saw teeth.

In a broad sense, it generally refers to a tool that separates items by repeatedly moving multiple contact points with huge pressure arranged in a single row. (as distinguished from knives and files) Common forms include woodworking saws, disc saws, band saws, wire saws, etc.

There are many kinds of saws, which can be divided into horizontal saws (for sawing wood), jigsaws (mainly used for sawing wood along the wood grain) and dig saws (also called wire saws, mainly used for sawing) According to the size of the sawtooth, it can be divided into coarse sawtooth (suitable for sawing larger and thicker wood), medium sawtooth (suitable for sawing wood of general size and thickness) and fine sawtooth (suitable for finer sawing). cutting); according to its shape, there are frame saws and panel saws. The saws are divided into large saws, two chainsaws, small saws, fish maw saws, circular saws, hand saws, hacksaws, knife saws, the largest being 3--4 meters long.

Today, frame saws are still widely used for root sawing of logs and lumberyards. Modern forms of Egyptian saws are still used by carpenters for finer work. There are many different types of saws made for different, the main difference is the size of the teeth and the number of teeth. Large teeth with fewer teeth are good for work, while fine-tooth saws are used for smoother and cleaner cuts.