Its very flexible, there are so many ways to use it, different altcoins and tokens have their own different purpose and you can use it freely, you can earn and send it, I think its the greatest advantage of being involved in cryptocurrency.
Actually cryptocurrency main purpose is digital payment but it's not possible in many countries because no merchants are accepting so people using it to make more money via crypto trading. The main advantage is this is decentralised money and no one can track our records. This is more useful when you do huge amount transaction.