Used primarily as a residual insecticide in vector control programs, especially for the reduction of mosquito populations that transmit malaria. Applied in indoor residual spraying (IRS), it remains effective on walls and surfaces for extended periods, killing insects that come into contact with treated areas. Due to its persistence and bioaccumulation, its use is restricted to specific public health applications under strict regulatory oversight, mainly in regions where malaria is endemic. Also used in agricultural settings in some countries to control pests such as ticks and lice on livestock, though such applications are limited due to environmental and health concerns.