An emergency exit is a designated doorway in a building, vehicle, or structure that provides a quick and safe means of evacuation during an emergency, such as a fire or other hazardous event. Emergency exits are crucial for rapid evacuation, especially when primary exits are blocked or inaccessible, and are identified by specific, clearly visible green "EXIT" signs with pictograms and safety lighting that operates during power failures. They are designed for easy operation, often with a horizontal push bar, to allow for immediate opening without assistance and must always be kept clear and accessible.