Debt
Money you owe and must repay, usually with interest. Not all of it is bad — a low-rate mortgage that buys an appreciating home is very different from a high-rate balance on a depreciating gadget. The rate and what it bought are what matter.
Where this is taught
Definitions are the trailer. These free levels turn Debt into something you play — one bite-size lesson, with worked examples, a quiz and XP.