No, cryptocurrencies and fiat money are not the same thing. Fiat money is traditional money that is issued and backed by national governments, such as dollars, euros or yuan. They have a physical representation in the form of banknotes and coins and are used in everyday payments. I think you should read the article at https://www.techguide.com.au/news/cryptocurrency/what-is-the-difference-between-cryptocurrencies-and-fiat-money/ to see for yourself. Both systems have their advantages and disadvantages and their interaction in the economy creates a variety of options for users.