The term "rocker panel" generally refers to an exterior body part found on most passenger automobiles. It is a panel that can be made out of metal or fiberglass and is located below the side doors. It typically runs the length of the exterior part of the vehicle that is between the front and back tires. The purpose of the rocker panel usually is to conceal the outer frame rail.

A rocker panel is designed to take the brunt of tar, oil, rocks, pebbles and other debris that comes flying out from under the front tires. This panel makes the sides of the vehicle more protected from damage, such as chips in the paint, which can contribute to rust. Typically, it is cheaper to replace a rusted rocker panel that it is to replace a damaged door panel. There are special coatings that can be applied to rocker panels that make them more resistant to chipping, rust and other damage. These coatings might be offered directly from the manufacturer, and many auto body shops offer rocker panel coating.

Not only can a rocker panel provide protection, it can also add to the aesthetic value of a vehicle. Some options offered by manufacturers are panels covered with chrome or painted in a color that is in contrast to the rest of the vehicle. Also, there are many automotive stores that carry decals that are designed specifically for a rocker panel.

Searching online for a decorative rocker panel or accessories to spruce up existing panels will bring up hundreds of websites that cater to almost every whim. Replacing a vehicle's standard rocker panel with a decorative one also is a somewhat easy and fairly inexpensive way to change or add to the looks of a vehicle. This can provide a fun way to personalize a vehicle and express oneself.