What is an airbridge?

An airbridge is a structure that connects the terminal building to the aircraft, allowing passengers to board and disembark without needing to go outside. This enclosed or partially enclosed walkway provides a safe and convenient passage while also protecting passengers from adverse weather conditions. The design of the airbridge facilitates a smoother flow of passengers, enhancing the overall travel experience and operational efficiency at airports.

The other options, while related to aviation, do not accurately define an airbridge. A retractable wing pertains to aircraft design, a communication tool refers generally to devices or methods used to convey information, and a cargo loading ramp is specifically used for loading and unloading cargo, but not for passenger boarding.