In the sprawling universe of PC gaming, few experiences rival the thrill of weaving through city traffic at 200 mph or drifting down a coastal highway in a hypercar that doesn’t officially exist in the base game. For fans of Grand Theft Auto V , Forza Horizon , Assetto Corsa , and Need for Speed , the term has become a golden ticket. It represents the holy grail of community-driven content: a single, comprehensive download that injects high-performance machines into your virtual garage.