The Cardholder is the entity that you issue cards to. In general, it is the Legal Entity that is linked to the Account Holder to which a Payment Instrument (card) is issued. It is not to be confused with an Authorized Card User.
To distinguish a cardholder from an authorized card user, consider the example in which a card is issued to a company. The company in this example is the Cardholder. An employee using the card can be considered the authorized card user.