1-Crypto currency is a form of virtual currency that can be used digitally 2-Bitcoin , Doge coins, Ripple etc. 3-The record s of crypto currency are stored securely in blockchain. 4-The first decenterlized crypto currency "Bitcoin was developed in 2009. 5-At present, there are more than 1000 crypto currency in the world till November 2021. 6-cryptc currency is a cost-effective technology. 7-lt also provides fast and highly secure. 8-crypto currency is a decenterlized technology there for people may- have trust issues. 9-however 'it is not considered as a legal tender across the world.