Variable valve timing (VVT) is a technology used in internal combustion engines to optimize performance and efficiency. It allows the engine's valves to open and close at different times, depending on the engine's speed and load. This adjustment helps improve power output, fuel efficiency, and reduces emissions. By changing the timing of the valve movements, VVT can enhance engine responsiveness and performance across a wider range of driving conditions. Many modern vehicles, including those from manufacturers like Honda and Toyota, utilize VVT systems to achieve better overall engine performance and meet stricter environmental regulations.