Cryptocurrency is a type of digital or virtual currency that uses cryptography for security. Unlike traditional currencies issued by governments (such as the US dollar or euro), cryptocurrencies operate on decentralized networks based on blockchain technology. Some well-known cryptocurrencies include Bitcoin, Ethereum, and Litecoin. These digital assets enable secure and transparent peer-to-peer transactions and are often used for various purposes, including as a store of value, a medium of exchange, or for smart contracts and decentralized applications (DApps). Cryptocurrencies have gained popularity as alternative investments and as a means to conduct borderless and censorship-resistant transactions.