Car spoilers are aerodynamic additions that are normally mounted on top of a car's trunk or positioned under the front bumper. Car spoilers make a car unique and stand out in a crowd. Car spoilers also improve the car's performance and sometimes stimulate its resale value. Racecars and highly customized rides incorporate car spoilers to reduce drag and improve handling at high speeds. A good spoiler or wing with a well adjusted deck can make the difference between losing a race or winning it, all else being equal.

Car spoilers used on a race car reduce its lift and drag, as well as increase the amount of force pushing the vehicle's tires to the road surface. These, in turn, would ensure to boost in traction, permitting the car to brake, turn, and accelerate properly and more forcefully. Even "cosmetic" car spoilers found on commercial cars modify airflow and could potentially affect traction. Car spoilers include not only rear ones that are mounted on the vehicle's trunk, but also front spoilers, installed below the bumper. They are also known an air dam. However, experts point out drivers that obey traffic laws won't be going fast enough to notice a difference. Factory, or aftermarket, car spoilers have great appeal, however, because they make any car look like a high-performance car, regardless of what's under the hood.

Many sport cars today come with car spoilers already installed. Even sport utility vehicles (SUVs) have car spoilers, attached above the rear window at the top of the rear door. Aftermarket car spoilers are also available for trucks, attached to the back of the cab. Car spoilers are quite easy to install, and usually come with sealing gaskets and mounting bolts. Most car spoilers are made from polyurethane, while some are made from lightweight steel or fiberglass. Some spoilers make use of a combination of two or three dissimilar substances. Car spoilers made of "high impact resin" have high density with extreme temperature resistance and are super impact resistant. These types are also lightweight and durable, and will not crack, separate or sag.

Car spoilers are commonly made of molded ABS plastic, molded fiberglass or resins. Some wings are made from aluminum. Aftermarket car spoilers can be purchased for a particular make and model, then painted to match the vehicle. Other car spoilers come pre-painted to match factory colors. Spoilers come in different weights, therefore adding any amount of mass to the rear of a car will impact driving in varying augmentations. A car with a good spoiler means that there is less resistance, which would result in a higher top speed.

There are a wide variety of styles of car spoilers to choose from. If you swap out a factory spoiler for a custom spoiler, the original screw holes will probably have to be patched, as the car spoilers will likely have different pedestal footprints. Universal car spoilers are designed to fit a variety of models but will need to be painted. Most spoilers are easy to self-install and come with instructions. Before installing, hold the spoiler in place to make sure it fits the body properly and looks good. Car spoilers are available universally, and can be ordered through the Internet as well. Many designs are offered for each vehicle manufactured. Generally, spoilers can be purchased unpainted so that one may have it painted for an accurate color match with their car.