Interior light
An interior light is a type of light that is generally used to illuminate the cabin of a vehicle. Interior lighting setups can vary greatly in both complexity and size, and certain vehicles, depending on a number of factors, may use simpler, more utilitarian lighting configurations, or choose to incorporate grander systems .
Application in automobiles
Courtesy, overhead, and dome lights
Many economy vehicles use more prosaic interior lighting systems, which is common as these types of vehicles tend to be much more affordable. These systems are usually in the form of overhead, dome, or courtesy lights, which are driver/passenger actuated and can generally be toggled via some button that can be easily located in the interior while driving or when parked..Dome lights are the brightest and largest of these simple lighting systems. They also tend to, at least partially, illuminate the entire vehicle, rather than just the front or back seats, and are usually built into the car's ceiling..
Overhead lights are similar to dome lights in the sense that they are brighter, but are, for the most part, limited to the front seats.
Courtesy lights are much smaller, and are generally intended to illuminate small areas of the cabin such as the trunk or glove compartment.