Insect vectors are organisms, typically insects, that transmit pathogens from one host to another. They play a crucial role in the spread of diseases such as malaria, dengue fever, and Zika virus. Common insect vectors include mosquitoes, ticks, and fleas, which can carry viruses, bacteria, and parasites. These vectors often become infected when they feed on the blood of an infected host. Once infected, they can pass the pathogens to other hosts during subsequent feedings. Understanding insect vectors is essential for controlling the spread of vector-borne diseases and protecting public health.