Insecticides are chemical substances used to kill or control insects that are considered pests. These chemicals can be classified into different categories based on their mode of action, such as neurotoxins, growth regulators, and stomach poisons. Insecticides are commonly used in agriculture to protect crops from insect damage and improve yields. However, their use can also have negative effects on non-target organisms, such as beneficial insects and other wildlife. Researchers in this area study the effectiveness, environmental impact, and safety of insecticides, as well as develop new formulations and methods for pest control.