What does the term "Gangway" best describe?

The term "Gangway" specifically describes an opening in the rail of a ship that provides access for personnel to board or leave the vessel. This term is a crucial aspect of naval terminology and is commonly used to direct crew and passengers. When a ship is docked, the gangway is typically the passage that allows access from the ship to the pier, facilitating safe and organized movement. Understanding this term is important in maritime operations, as it pertains to safe boarding procedures and overall ship access protocols. The other options, while relevant to military or maritime contexts, do not accurately define what a gangway is or its primary function on a ship.