A glideslope is a critical component of the Instrument Landing System (ILS) used in aviation. It provides vertical guidance to pilots during the approach and landing phases of flight. The glideslope helps ensure that an aircraft descends at the correct angle, typically around 3 degrees, to safely reach the runway. The glideslope is transmitted as a radio signal from the ground and is received by the aircraft's instruments. Pilots use this information, along with the horizontal guidance from the localizer, to align the aircraft with the runway. This system enhances safety, especially in low visibility conditions.