A bug zapper, also known as an electrical insect killer or electric insect eradicator, is a device that electrocutes flying insects that come into contact with an electrically charged grid. Bug zappers are typically used outdoors to control flying insect populations, such as flies, mosquitoes, and moths. They are typically powered by electricity, and some models may contain a light source to attract insects. Bug zappers are an effective way to reduce the number of flying insects in an area, and can be used to supplement other pest-control methods.