A saw is a tool used to cut through materials from tender to solid ones, but most of them are used to cut woods. Although the typical saws have relatively thick blades to make them stiff enough to cut trough materials, there are actually several types of saws. Saws can be made of diverged types of materials such as a blade, a wire, or a chain. The surfaces of the materials have a hard toothed edge on one side of the edges. You can visit that site to learn more.
The teeth are the ones which allow the saws to cut trough many kinds of materials, especially the hard and solid ones. The cut is made by placing the teeth of the saws against the materials and moving it back and forth forcefully or continuously forward. For the source of the force of the saw, it can be applied by hand or powered by steam, water, electricity, batteries or other power sources.