Airspace refers to the portion of the atmosphere controlled by a country above its land and waters. It is divided into different classes, each with specific rules and regulations governing the use of that airspace. These classifications help manage air traffic and ensure safety for both commercial and private aircraft. Airspace is essential for aviation operations, as it defines where aircraft can fly and how they interact with one another. Organizations like the Federal Aviation Administration (FAA) in the United States and the International Civil Aviation Organization (ICAO) globally oversee airspace management to maintain order and efficiency in the skies.