Credit Card Debt is an example of unsecured consumer debt, accessed through ISO 7810 plastic credit cards. Debt results when a client of a credit card company purchases an item or service through the card system. Debt accumulates and increases via interest and penalties when the consumer does not pay the company for the money he or she has spent.
The results of not paying this debt on time are that the company will charge a late payment penalty (generally in the US from $10 to $40) and report the late payment to credit rating agencies. Being late on a payment is sometimes referred to as being in "default". The late payment penalty itself increases the amount of debt the consumer has.
When a consumer has been late on a payment, it is possible that other creditors, even creditors the consumer was not late in paying, may increase the interest rates the consumer is paying. This practice is called universal default.
If the customer is carrying an amount of debt that is so high that it is over their credit limit, then they might be charged an over-the-limit fee of up to $39 until their balance is paid down to below their credit limit. This, too, may add to the consumer's debt.