A first officer is a licensed pilot who assists the captain in operating an aircraft. This role is crucial for ensuring the safety and efficiency of flights. The first officer is responsible for various tasks, including monitoring instruments, communicating with air traffic control, and managing flight operations alongside the captain. In commercial aviation, the first officer is often referred to as the co-pilot. They typically have completed extensive training and hold a valid pilot's license. The first officer works closely with the captain, especially during takeoff and landing, to ensure a smooth flight experience for passengers and crew.