Aerodynamic body shape

​ Aerodynamic design (streamling) reduces Drag.
This is the force wind causes on a hand outside a moving car window.
A car with less drag is faster.
Proper aerodynamics will produce better handling
​A Wedge shaped front end separates the air efficiently and presses the car to the ground improving steering.

Wind tunnels can be used to test body shapes.  Smoothly flowing air around the body indicates a streamlined (fast) shape.

Air flow is demonstrated with smoke,

or with lasers