Flies are a diverse group of flying insects that can be a significant nuisance and pose health risks due to their ability to transmit diseases. Common types of pest flies include house flies, fruit flies, drain flies, and cluster flies. They vary in size and appearance, but most flies have a pair of wings, compound eyes, and a rapid flight pattern.

House flies are among the most widespread pests, known for their grayish bodies and distinctive dark stripes on the thorax. They are often found in homes, especially around food, garbage, and decaying organic matter.

Pest flies are not just a nuisance but also a health concern, as they can carry and spread bacteria, viruses, and parasites that contaminate food and surfaces. This contamination can lead to various illnesses, including food poisoning, diarrhea, and other gastrointestinal issues. Controlling pest flies typically involves sanitation measures, eliminating breeding sites, and using traps or insecticides to reduce their populations.