Types. There are three primary types of credit cards including proprietary credit cards, travel and entertainment cards and revolving credit cards. Proprietary credit cards are issued by individual companies and may only be used by outlets owned by or authorized by the corporation.ignificance. According to the Public Broadcasting System, more than 115 million American credit card holders carry a balance on at least one card. The average credit card holder owned at least three different credit cards, and the credit card debt in households that carried a balance averaged nearly $16,000.