Tack is a piece of equipment or accessory equipped on
horses in the course of their use as
domesticated animals. Saddles, stirrups, bridles, halters, reins,
bits, harnesses,
martingales, and breastplates are all forms of horse tack. Equipping a horse is often referred to as
tacking up. A room to store such equipment, usually near or in a
stable, is a
tack room.