Stock cars are high-performance vehicles designed for racing, primarily in events like NASCAR. They are built to resemble standard production cars but are modified for speed, safety, and durability. These cars typically feature powerful engines, reinforced frames, and specialized tires to handle the demands of the racetrack. The term "stock" originally referred to cars that were close to their factory versions. However, modern stock cars are heavily customized, with specific rules governing their design and performance. This ensures a level playing field among competitors while maintaining the visual appeal of recognizable car models from manufacturers like Ford, Chevrolet, and Toyota.