i will compare the bitcoin to any bank .lets say that bank is the place or the things that you want save your money but we know that they collect interest from our savings when that year comes and comes the more interest will got on you thats how bank works and in bitcoin you only need to do just create online money to secure your bitcoin and no one can control you unlike banks do. you can used what you want you can get what you want and most of it they cant collect any interest on you.