The full form of DDT is Dichlorodiphenyltrichloroethane. It is an insecticide used in agriculture to kill pests and insects in crops. DDT was first synthesized in 1874 and was used to control typhus and malaria among civilians and troops during World War II. The United States banned the use of DDT in 1972 due to its harmful effects on the environment and living beings. However, some countries still use DDT to control mosquitoes that spread malaria. DDT is highly poisonous for all living beings and can accumulate in fatty tissues, persisting in the environment and animal tissues for a long time.