It seems like you're asking about cryptocurrency. Cryptocurrency is a digital or virtual form of currency that uses cryptography for security. Unlike traditional currencies issued by governments (e.g., dollars or euros), cryptocurrencies operate on decentralized networks based on blockchain technology. Bitcoin is one of the most well-known cryptocurrencies, but there are thousands of others with various features and purposes. Cryptocurrencies can be used for online transactions, investments, and as a means of transferring value without relying on traditional banks or financial institutions.