Unbounded cards refer to credit cards that can be used around the world, also known as overseas credit cards. Generally speaking, it means that the credit card can be used for payment at merchants in many countries and regions around the world without restrictions. This kind of card usually requires application and activation of related functions with the bank before use to ensure the security of account funds. The advantage of the unbounded card is that it can be used flexibly around the world, making it convenient for business trips, tourism and other occasions when payment needs to be made abroad.