The cabin pressure differential is important because it ensures that passengers and crew can breathe comfortably at high altitudes. At cruising altitudes, the external atmospheric pressure is too low for humans to breathe without assistance. By maintaining an optimal cabin pressure, the aircraft’s pressurization system simulates conditions similar to those at lower altitudes, making the environment inside the aircraft safe and comfortable. Additionally, monitoring the pressure differential is critical for maintaining the structural integrity of the aircraft, as excessive pressure differences can cause stress or damage to the fuselage.