Organophosphorus chemistry is a branch of chemistry that focuses on compounds containing phosphorus and carbon. These compounds often include phosphorus atoms bonded to organic groups, making them important in various applications, such as agriculture and pharmaceuticals. Many organophosphorus compounds are used as pesticides and herbicides due to their effectiveness in controlling pests. Additionally, they play a role in the development of flame retardants and plasticizers. The study of these compounds helps scientists understand their properties and potential environmental impacts.