Hydrogen cyanide is a colorless, highly toxic gas with a faint, bitter almond smell. It is used in various industrial processes, including the production of plastics and synthetic fibers. Due to its toxicity, exposure can lead to serious health effects, including respiratory failure and death. In nature, hydrogen cyanide can be found in certain plants, such as bitter almonds and cassava, where it is present in small amounts. It is also produced during the combustion of organic materials, making it a potential hazard in fires. Proper safety measures are essential when handling this chemical.