The correct answer is A digital cryptocurrency. BitcoinIt is a decentralized digital currency without a central bank or single administrator that can be sent from user to user on the peer-to-peer bitcoin network without the need for intermediaries. It was created in January 2009. It follows the ideas set out in a whitepaper by the mysterious and pseudonymous Satoshi Nakamoto. Bitcoin is open-source, its design is public, nobody owns or controls Bitcoin and everyone can take part. CryptocurrencyA 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. Types of Cryptocurriencies: There are over 10000 different types of cryptocurrency. Some common cryptocurrencies are Bitcoin, Litecoin, Ethereum, Ripple, etc. Advantages:Cryptocurrencies hold the promise of making it easier to transfer funds directly between two parties without the need for a trusted third party like a bank or credit card company. Disadvantages:The semi-anonymous nature of cryptocurrency transactions makes them well-suited for a host of illegal actions such as money laundering and tax evasion.