How do credit cards work?
A credit card lets you borrow up to a set limit from the issuer, then repay what you spend by the statement due date to avoid interest. Pay in full every cycle and the card is effectively free to use — and reports your on-time payments to the credit bureaus, building your credit history along the way.
Every swipe or tap runs over a payment network (Visa, Mastercard, American Express, or Discover) that routes the transaction to your issuer, which fronts the merchant the money instantly. Your purchases accumulate over a roughly 28-31 day billing cycle; at the end of it, the issuer sends a statement showing the balance and a minimum payment. If you pay the full statement balance by the due date, most cards charge zero interest on that cycle's purchases — this is the grace period, and it's the single biggest lever in how a credit card either costs you nothing or costs you a lot. Carry any balance past the due date and the issuer starts charging interest (APR) on the unpaid amount, typically compounding daily. Separately from interest, your issuer reports your balance and payment history to Equifax, Experian, and TransUnion roughly once a month, which is how responsible credit card use builds a credit score — a mechanism no debit or prepaid card offers, since neither involves borrowing.
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