The bit is an item of a horse's tack. It usually refers to the assembly of components that contacts and controls the horse's mouth, and includes the cheekpieces and mouthpiece, all described here belo
A horse wearing an English bridle with a snaffle bit, the end of which can be seen just sticking out of the mouth. The bit is not the metal ring.
Horse skull showing the large gap between the front teeth and the back teeth. The bit sits in this gap, and extends beyond from side to side.
A Luristan bronze horse bit
The bits of a double bridle, showing both a type of snaffle bit called a bradoon and a curb bit
A bitless bridle is a general term describing a wide range of headgear for horses or other animals that directs the animal without using a bit. Direction control may also be via a noseband or cavesson
A cross-under bitless bridle
A classic bosal-style hackamore
An English-style Jumping Cavesson