In accessible language, you can say Cryptocurrency is an electronic currency online currency which not exist in physical form like the cash we carry in our purse to spend somewhere freely
crypto is stored in crypto wallets such as Binance, WazirX, Coinbase, MetaMask, etc… from where you can transfer currency to someone or trade (Buy & Sell) and can multiply your cryptocurrencies through trading
However, Crypto is not legal in the majority of countries like INDIA, the US, CHINA, CANADA, etc..
But El Salvador was the first country which officially legalizes the use of Crypto on 9 June 2021.
Swipe Up and read Full Basis about What is Cryptocurrency? before entering in crypto market