Bitcoin: The original and most widely known cryptocurrency, Bitcoin is a digital asset based on a decentralized peer-to-peer network that uses cryptography to secure transactions.
2. Ethereum: A blockchain platform for developers to build and deploy decentralized applications (dApps). It also has its own cryptocurrency called Ether which can be used to pay transaction fees or purchase goods and services.
3. Litecoin: A fork of the Bitcoin protocol with faster block times, lower transaction fees, and improved scalability compared to Bitcoin.
4. Ripple: An open source payment system designed for banks and financial institutions to send money quickly across borders without having to use traditional banking systems or third parties like Western Union or MoneyGram.