Dichloro-diphenyl-trichloroethane (DDT) is the world famous synthetic organochlorine broad-spectrum insecticide used in the control of mosquito vectors of malaria and insect pests of agriculture in developing countries, due to its low cost and high efficiency. This book discusses properties, uses and toxicity of DDT. Chapter One reports the empty-orbital electronic structure and experimental data of dissociative electron attachment (DEA) to the gas-phase molecules DDT and its principal metabolite DDE, which possesses good electron-withdrawing abilities. Chapter Two reviews the past, present and future of DDT and pyrethroid resistance in Aedes aegypti (L.) and Aedes albopictus (Skuse). Chapter Three studies the photocatalytic selective oxidation of DDT.