Usually things appear because there is a need, because there is a demand, people have ideas and create things because they see something is missing and such a certain product or service appears.
That's why it appeared and that's why we need it and that's why people use it.
Indeed. For a simple fact that people together with the economy do really need some innovation when it comes to currency to obtain success. In a simple way of saying, we need Bitcoin existence because of its purpose that was depending on us users who have been into this kind of cryptocurrency. Actually, it is not intended to be stated that it is really a need, instead it was just brought by encouragement why people thinks they need Bitcoin in their life because of the benefits it can give and provide.
We really need bitcoin since we need this payment system where we can receive money from our friends living abroad. Amazing improvement!