AbstractChemical warfare is one of the most appalling and destructive types of warfare in which various types of deadly and toxic chemicals are used as chemical weapons. These chemical weapons containing CWAs have very terrible and long-term negative effects on humans, animals and the environment. Many times in history, these chemical warfare agents are prohibited by various treaties. However, it is very difficult to ban all CWAs because of their industrial applications. This chemicals may be misused by militant organizations, or nations without nuclear power, as chemical weapons. These CWAs, which could be misused as chemical weapons, will always remain a threat to public security and global security. In this review, we will briefly discuss about chemical warfare agents and their types, physicochemical properties and their effects on humans and the environment.