Pyrotechnics are chemical reactions that produce heat, light, gas or smoke and are used as distress signals. There are different types including rocket parachute flares, hand flares, and orange smoke signals. The document outlines the requirements and proper use of each type according to international regulations. Key requirements include minimum burning times, heights, smoke visibility periods and storage locations on ships. Proper handling and maintenance of pyrotechnic distress signals is important for safety during emergencies at sea.