The drag coefficient (Cd) is a measure of how much aerodynamic drag an object experiences when it is moving through a fluid. The lower the Cd, the less drag the object experiences. For a car, a lower Cd means that the car can travel more efficiently at high speeds.
The 2014 Toyota Camry has a Cd of 0.28, which is relatively low for a sedan. This means that the Camry can achieve good fuel economy at high speeds.