Gravitics is the as-yet theoretical science of artificially generating and manipulating gravity. It is one of the most widely used and idealized speculative technologies on science fiction, responsible for everything from space drives to flying cars to tractor beams.
Because our real-world understanding of the quantum nature of gravity is still evolving, it is unknown if gravitic technology can ever become a reality. But if it could, it would have a profound effect on human society, changing not only transportation but agreat many aspects of civilization.
Flying cars and more.
Manipulating gravity for space propulsion.