Electronic money, also known as crypto, is a form of digital currency that uses blockchain technology to ensure security and transparency in transactions. Launched with Bitcoin in 2009, cryptocurrencies have grown strongly and many different types have appeared such as Ethereum, Ripple, and Litecoin. Cryptocurrency transactions do not require the intervention of third parties such as banks, reducing costs and increasing transaction speed. In addition, blockchain technology also allows the implementation of smart contracts, opening up many potential applications in many different fields. However, the cryptocurrency market also faces many challenges such as large price fluctuations, cybersecurity risks and lack of full legal regulation in many countries. However, the potential of cryptocurrencies and blockchain technology to change the way transactions and data management are still a topic of interest and research.