it as a digital currency or virtual currency, works under the concept of decentralization. (i.e) it would not have a physical appearance but can be traded or exchanged via any trading platform without the control of central banks or any other government authorities. Bitcoin is the most popular cryptocurrency (Check out the price of single unit bitcoin here). Industrial name of bitcoin is BTC.

A cryptocurrency is a digital or virtual currency that is secured by cryptography, which makes it nearly impossible to counterfeit or double-spend. Many cryptocurrencies are decentralized networks based on blockchain technology—a distributed ledger enforced by a disparate network of computers. A defining feature of cryptocurrencies is that they are generally not issued by any central authority, rendering them theoretically immune to government interference or manipulation.