Why is it important to ensure that exit doors are secure before takeoff?

Ensuring that exit doors are secure before takeoff is crucial for maintaining safety during flight operations. Properly secured exit doors prevent any accidental opening while the aircraft is in the air, which could lead to serious safety risks for passengers and crew. An open exit door during flight could result in rapid decompression, loss of cabin pressure, and can jeopardize the structural integrity of the aircraft. Therefore, rigorous checks on the locking mechanisms and conditions of the doors are vital before takeoff to ensure the safety and security of everyone on board.