Fetters are a type of restraint used to immobilize or restrict the movement of a person or animal. They can take many forms, such as chains, ropes, shackles, or handcuffs, and are often used for punishment, torture, or imprisonment. They can also be used in BDSM play as a form of consensual restraint between adults. It is important to use fetters safely and responsibly, and to be aware of the risks and potential consequences of using them.