Altitude refers to the height of an object or point in relation to sea level or ground level. It is a crucial concept in various fields, including aviation, meteorology, and geography. For instance, the Mount Everest, the highest peak in the world, has an altitude of approximately 8,848 meters (29,029 feet) above sea level. Understanding altitude is essential for activities such as hiking, flying, and even weather prediction. Changes in altitude can significantly affect temperature, air pressure, and oxygen levels, which is why climbers often acclimatize to higher altitudes to prevent altitude sickness.