Cryptocurrencies are encrypted virtual currencies that use digital technology to secure transactions and control the creation of new units. Among the most famous are "Bitcoin" and "Ethereum", and they have become an important part of the global digital economy. These currencies rely on blockchain technology, which provides an immutable record of transactions. Digital currencies have received increasing attention from investors and governments, but they face legal challenges and significant fluctuations in value. Nevertheless, they are seen as a promising future financial tool.