The concept of money is in itself complex. Why can a slip of paper in the form of a dollar bill, a Euro, a yen, a pound, or a rand be exchanged for tangible goods like bananas, books, and bedsheets? In simple terms, we use the money for buying what we need to use or consume on a regular basis.
What would currencies look like if we were to remove the central bank and build our units of exchange around a decentralized system? This is what cryptocurrencies offer.