An Appearance Bond of Witness is a surety bond, typically in the form of a written contract, that is used to guarantee a witness's appearance in court. It is a legally binding agreement between a witness and a surety, which is usually an insurance company or a professional bail bondsman. The surety agrees to pay a certain amount of damages should the witness fail to appear in court. The bond is usually provided by the witness's family or friends, but can also be provided by a professional surety company. The amount of the bond is usually set at the discretion of the court. There are two types of Appearance Bond of Witness: a criminal appearance bond and a civil appearance bond. A criminal appearance bond is used to ensure the appearance of a witness in a criminal trial, while a civil appearance bond is used to ensure the appearance of a witness in civil proceedings.