rotating wheel having teeth which mesh with another cogwheel or toothed part, used to transmit torque, convert rotation to translation or rarely other purposes

Gears are mechanical parts with cut teeth designed to fit with teeth on another part or gear so as to transmit or receive force and motion. Gears are also sometimes called toothed wheels or cogged wheels or cogs. The cut teeth are also sometimes called cogs.

Intermeshing gears in motion
Wooden cage gear in a mill

Numerous nonferrous alloys, cast irons, powder-metallurgy and even plastics are used in the manufacture of gears. However steels are most commonly used because of their high strength to weight ratio and high cost.

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