Climb rate refers to the speed at which an aircraft gains altitude, typically measured in feet per minute (fpm). It is an important performance metric for pilots, as it indicates how quickly an aircraft can ascend after takeoff or during a climb phase. Factors affecting climb rate include the aircraft's weight, engine power, and atmospheric conditions. A higher climb rate is generally desirable for quicker altitude gains, especially in situations like avoiding obstacles or responding to emergencies. Pilots often monitor climb rate using instruments in the cockpit, ensuring they maintain safe and efficient ascent during flight operations.