A commercial bill is an instrument issued by a drawer, entrusting the drawee to make an unconditional payment of a specified amount to the payee or holder on or by a designated date. It is categorized into bank acceptance bills and commercial acceptance bills, with a maximum maturity of six months. Commercial bill services refer to the services provided by the bank through its bill business system, offering clients services such as issuance, acceptance, endorsement, guarantee, discounting, payment and recourse for commercial bills, thereby handling the transmission and registration of bill business information and fund clearing.