The main point of cryptocurrency is to fix the problems of traditional currencies by putting the power and responsibility in the currency holders' hands. All of the cryptocurrencies adhere to the 5 properties and 3 functions of money. They each also attempt to solve one or more real-world problems.
The main purpose of cryptocurrency is for exchanging the things and buy any kind of luxury or important thing or services and the other thing is that there are no one control or authority on that. so it's gives a freedom financially.