Altitude control refers to the ability to maintain a specific height above sea level, which is crucial in aviation and other fields. In aircraft, altitude control systems help pilots manage the plane's elevation during flight, ensuring safety and efficiency. These systems can include autopilot features that automatically adjust the aircraft's altitude based on pre-set parameters. In addition to aviation, altitude control is important in activities like mountaineering and scuba diving. For climbers, managing altitude is vital to prevent altitude sickness, while divers must control their ascent and descent to avoid decompression sickness. Proper altitude control enhances safety and performance in these activities.