What does Vy refer to in aircraft performance?

Vy refers to the speed that provides the best rate of climb for an aircraft. This speed allows the aircraft to gain altitude in the most efficient manner over a given period of time, maximizing the vertical speed in the climb phase. Pilots use Vy to ensure they are climbing effectively and making the best progress upwards after takeoff or during a climb-out. Understanding and applying Vy is crucial for maximizing performance, particularly in scenarios where altitude gain is necessary for clearing obstacles or when operating in less-than-ideal conditions.