Answer:
The buyer doesn’t want it, the producer doesn’t need it and the user doesn’t know their using it.
What goes trough your head but you forget it like 3 days after?
I cannot be felt, seen or touched; Yet I can be found in everybody; My existence is always in debate; Yet there is a style of music named after me.
We traveled the sea far and wide. At one time, two of my sailors were standing on opposite sides of the ship. One was looking west and the other one east. And at the same time, they could see each other clearly. How can that be possible?
Sometimes imaginary and sometimes real, sometimes they are the closest and dearest person outside the family. Who are they?
Though not a plant, has leaves. Though not a beast, has spine. Though many wouldn't need this thing, It's more valuable than wine.