Answer:
What word begins and ends with an E, but only has one letter?
What goes up a chimney down but can't go down a chimney up?
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it, can't see it. What is it?
I am a delicious way of representing data.
They are many and one, they wave and they drum, used to cover a stare, they go with you everywhere.
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.