Black card generally refers to the black card of credit card, which belongs to the top credit card. With such a black card, customers can enjoy top services in various fields, including life, work, travel and entertainment. Services can be said to be readily available, very human and caring. Cardholders can also enjoy the "all-round personal assistant" service and many privileges provided by banks. The credit limit of a black card can be intelligently increased, which means there is no upper limit. Generally, black cards are handled by banks on their own initiative according to customers' conditions, and they cannot apply for them themselves.