is a digital currency that uses cryptography to secure transactions and is not controlled by a central authority like a bank or government. Cryptocurrencies are stored in a digital ledger that is spread across many computers on a network, making them decentralized and difficult to hack. 
Here are some things to know about cryptocurrency:
How it works: Cryptocurrencies use public-private key cryptography to transfer coin ownership. A private key is a secure password that is used to send value, while a public key is shared with others to receive value. 
How it's different from traditional currency: Cryptocurrencies are not legal tender and are not backed by real assets. Traditional currencies are produced by the government