ДДТ, or DDT, is a synthetic pesticide that was widely used in agriculture and for controlling disease-carrying insects, particularly mosquitoes. It was first developed in the 1940s and became popular due to its effectiveness in killing pests and preventing the spread of diseases like malaria and typhus. However, DDT was later banned in many countries because of its harmful environmental effects and potential health risks to humans and wildlife. It accumulates in the food chain, leading to adverse effects on birds and other animals. Today, its use is restricted, and safer alternatives are encouraged for pest control.