A supercar is a very expensive and high-performance sports car or grand tourer. The term is used in marketing by automakers for unusual, high-end vehicles, and has been used to refer to at least four different sorts of cars: Limited-production specials from an "elite" automaker. Standard-looking cars modified for power and performance. Models that appeal to enthusiasts, from smaller manufacturers. One-of-a-kind "showcase" project vehicles built by custom car retrofitters (usually extensively modified collectible muscle cars or grand tourers updated to the latest "streetable" racing technology).