Cryptocurrencies are cryptographic digital currencies that you can use as a mode of payment for your business. Apart from that, you can also use them for investment or trading.
Generally these cryptocurrencies are decentralized, that is there is no authority body that backs these currencies.
Some of the major examples of cryptocurrencies are Bitcoin, Ethereum, XRP, Tether, Dogecoin, USD Coin, Binance, Cardano, etc.