Pesticides are chemical substances or mixtures of chemicals that are used to control, repel, mitigate, or kill pests. Pests can include a wide range of organisms such as insects, weeds, fungi, rodents, nematodes, and other undesirable organisms that can negatively impact agriculture, public health, or the environment. Pesticides are designed to protect crops, control disease vectors, manage pests in homes and gardens, and address various pest-related issues.