A cheque (or check) is a paper used to give money from one person or business to another person or business. To the person getting the cheque, it is a paper that allows them to go to a bank and get money. To the person writing the cheque, it is a promise to pay the bank that is giving the money to the person who turned the cheque in.
Cheques must be written to a person or business. A cheque that is not written to anyone can be very bad because if it is lost, anyone who finds it can get the money. A cheque that is written to a person but does not have the amount of money written is a blank cheque.
Cheques have been used since over a thousand years ago. However, they became popular in the 20th century for paying money without using cash.