The purpose is based on the goal of creation - the formation of a monetary unit that will provide free access and independent functioning in the virtual space - the Internet. Many compare the cryptocurrency with an ordinary electronic wallet, but in this aspect there are fundamental differences.
Cryptocurrency function only on the Internet. You can withdraw them only through an exchange for fiat money - a common currency.
Accordingly, such currency is used in settlements and transactions around the world, bypassing the multilevel exchange of national currencies.
You can have many other functionalities when it comes to bitcoin rather being used electronically as we all know, it can be used in issuing bonds and hopefully we will see that happening in the future rather than government bonds with empty promises, hope you have heard about physical bitcoins, it is the beginning state and we will have much more functionality in the future rather than being just a speculative coin and the real mission was to give the opportunity for everyone to trade freely without the intervention of the corrupt governments around the globe but governments are trying to restrict this market with regulations.