In the past, credit cards are mainly divided into classic cards and gold cards only, but with the popularity of credit cards, there are many levels of credit cards, such as classic cards, gold cards, platinum cards and titanium cards. Please note that even cards may have the same name but banks have different definitions regarding their levels.
Generally credit cards are of high levels if they have higher limits, more privileges and more application requirements. But some premium cards are invitation-only like the American Express Centurion Card, even though you get very high salary you might not be able to own it, and this is generally regarded as the most exclusive premium card.