Takeoff weight refers to the total weight of an aircraft at the moment it begins its takeoff. This weight includes the aircraft itself, fuel, passengers, cargo, and any other items on board. It is a critical factor in aviation, as it affects the aircraft's performance, including its ability to climb and maintain altitude. Calculating takeoff weight is essential for ensuring safety and efficiency during flight. Each aircraft, such as the Boeing 747 or Airbus A320, has a maximum takeoff weight limit, which must not be exceeded. Exceeding this limit can lead to difficulties in takeoff and increased risk during flight.