My first come to mind when we say currency is the money that spend on a whole day to survive , it is many kind of currency in all over the world, I think currency is the most helpful for our dailyneeds.
Yes, everything in this world needs money to survive of our daily needs. The currency helps us to buy our foods, paying bills and other expenses we need. There are more currency in this world all of this currency is helping us in our daily lives.