This document defines vocabulary related to firefighting gear and equipment. It explains that gear refers to equipment used to do certain tasks, and defines specific gear like fire engines which are trucks used to help put out fires. It also defines firefighters as people who work to put out fires, and emergencies as unplanned events that require a quick response. Other terms defined include dispatch which is sending a message, chief which refers to a group leader, and firehouse which is where firefighters live and keep fire engines.