A bit is a device placed in a horse's mouth, kept on a horse's head by means of a headstall. There are many types, each useful for specific types of riding and training.
The mouthpiece of the bit does not rest on the teeth of the horse, but rather rests on the gums or "bars" of the horse's mouth in an interdental space behind the front incisors and in front of the back molars. It is important that the style of bit is appropriate to the horse's needs and is fitted properly for it to function properly and be as comfortable as possible for the horse.
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The basic "classic" styles of bits are:
* Curb bit
* Snaffle bit
* Pelham bit
* Weymouth or Double Bridle
While there are literally hundreds of types of bit mouthpieces, bit rings and bit shanks, essentially there are really only two broad categories: direct pressure bits, broadly termed snaffles; and leverage bits, usually termed curbs.
Bits that act with direct pressure on the tongue and lips of the bit are in the general category of snaffle bits. Snaffle bits commonly have a single jointed mouthpiece and act with a nutcracker effect on the bars, tongue and occasionally roof of the mouth. However, regardless of mouthpiece, any bit that operates only on direct pressure is a "snaffle" bit.
Leverage bits have shanks coming off the mouthpiece to create leverage that applies pressure to the poll, chin groove and mouth of the horse are in the category of curb bits. Any bit with shanks that works off of leverage is a "curb" bit, regardless of whether the mouthpiece is solid or jointed.
Some combination or hybrid bits combine direct pressure and leverage, such as the Kimblewick or Kimberwicke, which adds slight leverage to a two-rein design that resembles a snaffle; and the four rein designs such as the single mouthpiece Pelham bit and the double bridle, which places a curb and a snaffle bit simultaneously in the horse's mouth.
In the wrong hands even the mildest bit can hurt the horse. Conversely, a very severe bit, in the right hands, can transmit subtle commands that cause no pain to the horse. Bit commands should be given with only the quietest movements of the hands, and much steering and stopping should be done with the legs and seat.