Video narration
How can a number on your screen buy a snack? At the shop, its price tells you how many shared units it costs, letting you compare it with other things. Those units are currency: shared money used to price things and pay for them. When you hand over coins or notes, the shop gets cash. When you tap a card, banks and payment systems record the payment; no notes change hands. Either way, the shop accepts that amount for the snack. Here's the flip: the paper or screen has no magic value. Currency works because people share confidence in those units, while institutions and payment systems support and record their use. If snack prices rise, the same amount buys less. Your screen number buys the snack because you and the shop accept the same money, and the payment system records your payment.