Why is Food served on Banana leaf?

Why is Food served on Banana leaf?
When cooking food with or serving or wrapping food with banana leaves, they may confer an aroma to the food leaves; steaming with banana leaves imparts a subtle sweet flavor to the dish.
The leaves contain the juices, protect food from burning and add a subtle flavor. In Tamil Nadu (India) leaves are fully dried and used as packing material for food stuffs and also making cups to hold liquid foods. 
Especially in the South Indian states of Tamil Nadu, Karnataka, Andhra Pradesh and Kerala in every occasion the food must be served in a banana leaf and as a part of the food a banana is also served.