Aerodynamics refers to the flow of air around the vehicle. This flow depends on the shape of the vehicle. Air resistance causes the vehicle to slow down and consume more energy. Good aerodynamics will reduce your drag and provide for better efficiency.
The most ideal shape, for little air resistance, is a droplet. That means a rounded front end with a streamlined roof and a rear end with as little surface area as possible. The droplet shape is clearly visible in the design of SHOW.