A bug zapper, more formally called an electrical discharge insect control system, electric insect killer or (insect) electrocutor trap, is a device that attracts and kills flying insects that are attracted by light.
Insects and arachnids are a normal part of virtually every human household, the researchers say. ... "While the idea of uninvited insect roommates sounds unappealing, bugs in houses may contribute to health in a roundabout way," Trautwein says. But no matter what they might say, insects being uninvited guest would always cause distress and inconvenience. One would always want to get rid of them, so we would rather say, KILL THEM!