It is a digital world with transactions being done by mobiles, computers in which payment of the currency you deal with is transferred online. But these currencies are issued by the central bank and are called centralised currencies, as the central banks are the issuers of these currencies. In 1983, the American cryptographer conceived an anonymous cryptographic electronic money called ecash. Later in 1995, he implemented it through digicash, an early form of cryptographic electronic payments which required software to withdraw notes from a bank and designate specific encrypted keys before it can be sent to the recipient. This allowed the digital currency to be untraceable by the issuing bank, government, or any third party. A cryptocurrency is a decentralised digital currency that can be used to buy goods and services but uses an online ledger with strong cryptography to secure online transactions. But most of the interest in the currency is to trade for profit (or loss) with speculators at times driving its prices waywardly. One needs to exchange real currency for the cryptocurrency to access the goods or services or to trade in them. Cryptocurrency is a medium of exchange that uses advanced technology for the security of the system. The currency is not real that is why the word Crypto means hidden.