Cryptocurrencies, like traditional currencies, are a medium of exchange for goods and services. They are digital currencies created and stored on a blockchain, such as Polygon or Ethereum, and secured by cryptography. Every transaction through cryptocurrencies is validated by validators and recorded on an immutable distributed ledger. No central authority oversees these transactions. Cryptocurrencies can be minted on a blockchain through mining or can be earned as rewards. Bitcoin, Ethereum, Solana, Cardano, Ripple, Pi, and GRASS are famous cryptocurrencies.