Forging, a metal forming technique that uses localized compressive forces, has been a primary metal fabrication technique since the days of ancient Mesopotamia. Forging has undergone significant changes since its origins on the Fertile Crescent, resulting in a more efficient, faster, and more durable craft. That's because forging is most often done today with forging presses or hammering tools powered by electricity, hydraulics, or compressed air. Some commonly used forging materials are carbon steel, alloy steel, microalloyed steel, stainless steel, aluminum and titanium.