A reaction time test is a quick and fun way to find out how fast your brain can respond to something happening. Whether it’s a light turning green or a shape popping up on a screen, your job is to react as fast as possible—usually by clicking a mouse or tapping a button. The test measures how many milliseconds it takes you to respond after the signal appears. It’s often used in gaming, sports, and even driving tests to check alertness and coordination. The faster your reaction time, the sharper your reflexes!