Since time immemorial, Currency has been an important part of lives. In the caveman era, they used the barter system. The barter system is one of the earlier forms of exchange. A barter system is the system of exchange where goods and services are exchanged directly for other goods and services. But the barter system lost its impact when a few of its flaws came to light. Flaws like : people's requirements need to coincide. There's no common measure of value. Not all goods can be divided or subdivided. Goods cannot be transported easily. After the realization, (and several iterations later), Modern currency As we know it, came into existence:- 110 BC, an official currency was minted. 1250 AD, Gold plated florins were introduced. 1600 AD - 1900 AD, the paper currency gained widespread popularity. After that Modern currency came which is : paper currency and coins. credit cards and digital wallets(like PayPal, Paytm, amazon pay, etc.). All of these controlled by the banks and go...