Pesticide chemistry is the study of the chemical compounds used to control pests, including insects, weeds, and fungi. These compounds can be natural or synthetic and are designed to target specific organisms while minimizing harm to non-target species. Understanding the chemical structure and behavior of these substances helps in developing effective and safe pest control methods. The effectiveness of pesticides depends on their mode of action, which refers to how they affect the target pest. Factors such as environmental conditions, application methods, and pesticide formulation also play a crucial role in their performance and safety. Proper use and regulation are essential to protect human health and the environment.