what is the sub roof
Just as a sedan is a distinctive type of automobile, a moonroof is a type of sunroof. Sunroof is the generic term used to describe any panel in a vehicle roof which can let in light and/or air. While most sunroof panels are operable, some may be fixed. The term moonroof was used in the 70's to describe a glass panel inbuilt electric sunroof, and is now used generically to describe all glass panel inbuilt sunroofs. An inbuilt sunroof is one where the operable panel slides between the vehicle roof and headliner, and is often powered but may be manually operated.