Hammer is described as an instrument for driving nails, beating metals, and the like, consisting of a head, usually of steel or iron, fixed crosswise to a handle. The hammer usually has a curved claw used to extract nails.

Likewise, a hammer is a tool meant to deliver blows to a target, causing it to move or deform. The most common uses are for driving nails, fitting parts, and breaking up objects. Hammers are often designed for a specific purpose, and so their design varies quite a lot. Usual features are a handle and a head, with the balance firmly in the head. The head is composed of a flat, striking surface on one end, and a peen on the other. The peen can be shaped like a claw or wedge to pull nails, or like a ball as in the ball-peen hammer. The hammer is used in many professions, and is one of the most basic tools along with the knife. It has many types/kinds: claw hammer, ripping hammer, etc.