The field of digital currency or electronic money is a type of currency that is available only in digital form and does not have a physical presence (such as banknotes and coins). It has similar characteristics to physical currencies but allows instant transactions and unlimited trئansfer of ownership. A digital currency is a financial balance electronically recorded on a stored-value card or another device. Another form of electronic money is network money, which allows value to be transferred over computer networks, particularly the Internet. Electronic money is also a claim on a private bank or other financial institution such as bank deposits. In this course, we will talk about the most famous currency in the world, “Bitcoin.”