Everything you own: all your assets (property, cars, investments, savings, insurance payouts, artwork, furniture etc) minus any liabilities (debts, current bills, payments still owed on assets like cars and houses, credit card balances and other outstanding loans). When you’re alive this is called your wealth; when you’re dead, it becomes your estate.
Used by the holder to buy goods and services, credit cards also have a monthly or annual spending limit, which may be raised or lowered depending on the creditworthiness of the cardholder. But unlike charge cards, borrowers aren’t forced to pay the balance off in full every month and, as long as they make a stated minimum payment, can carry a balance from one month to the next, generating compound interest. As the issuing company is effectively giving you a short-term loan, most credit cards have variable and relatively high interest rates. Allowing the interest to compound for too long may result in dire financial straits.