Mosquito nets are used to prevent mosquito bites and protect against mosquito-borne diseases like malaria, dengue, and Zika virus by creating a physical barrier over sleeping areas. They are particularly crucial in areas where screened or air-conditioned rooms are unavailable. Insecticide-treated nets (ITNs) are also used as a vector control method, as the insecticide helps to kill, repel, or sterilize mosquitoes that come into contact with the net, creating a community-wide protective effect.