This enables us to trade amounts of money which represents value instead of actually trading eggs for shoes. Currency speeds up the process, making it faster and easier. Money is NOT currency . Currency is NOT money . That is the second concept to grasp.
Currency merely represents money.
Since money is unreal, it would be convenient to have something real to represent it. We need something we can get our hands on to use in our daily lives. So, we used our human mind and invented currency to represent money. Now we have something real that we can hold in our hands and use to exchange value. But beware of a pitfall.