Ans: Cryptocurrencies are digital units, the emission of which takes place on the Internet, and the principles are based on cryptography. The creation of all crypto coins is based on blockchain technology - a chain of blocks ordered according to certain rules, the immutability of which is ensured by the use of cryptography. All transactions are closed and using keys. It is necessary to distinguish between the concept of "cryptocurrency (coin)" and "token". The token does not use its own blockchain and is created on a third-party platform (for example, Ethereum) according to a standard template.
Ans: According to the Coinmarketcap resource as of 01/03/2021, there are 4154 different cryptocurrencies. The total market capitalization of virtual assets is more than $ 274 billion, approximately 75% of this amount is shared by the 20 largest blockchain projects.