<human>:  When is the Bill of exchange used?
<bot>: The Bill of exchange is used as a way to transfer money between two parties. The Bill of exchange is a written order for a person or organization to pay a specific amount of money to another party. The person who receives the money is called the "receiver", and the person who gives the money is called the "drawer". The bill of exchange is a legal document, and it must be signed by both parties.