The Vision Gran Turismo program (commonly abbreviated Vision GT or VGT) is a series of concept cars for the Gran Turismo video game series, developed by a cross-section of the world's top automobile manufacturers. These cars appeared originally in the video game Gran Turismo 6, and later made an appearance in each subsequent Gran Turismo installment (Gran Turismo Sport and Gran Turismo 7), all developed by Polyphony Digital. For the most part, they apply present-day technology and materials, with a handful of notable exceptions that utilize novel propulsion and aerodynamic technologies. Their appearance as free update content has been staggered since the launch of GT6 in 2013, with each one being available for download upon release.