Saw

A saw is a tool consisting of a tough blade, wire, or chain with a hard toothed edge used to cut through material. Various terms are used to describe toothed and abrasive saws.

Saws began as serrated materials, and when mankind learned how to use iron, it became the preferred material for saw blades of all kind. There are numerous types of hands saws and mechanical saws, and different types of blades and cuts. Provided by Wikipedia