How do credit card companies like Visa and Mastercard make money? How do credit card issuers such as major banks, local banks and credit unions make money on their credit cards?

What risks does a bank face when issuing a credit card to a new customer? How can the bank reduce the impact of these risks?

What risks do new card holders face? What can they do to minimize the impact of those risks?

Why is a credit card considered to be an unsecured loan? How does it differ from a home mortgage or auto loan?

Easy questions PLEASE PLEASE PLEASE answer all of them. Thanks