Flies are insects belonging to the order Diptera (di = two, ptera = wings), characterized by a single pair of wings and a pair of halteres for balance. This distinguishes true flies from other insects with "fly" in their name, like dragonflies or butterflies. Some species, like those in the superfamily Hippoboscoidea, have even lost their wings entirely and adapted to unique lifestyles.

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With over 240,000 estimated species, including mosquitoes, gnats, and midges, flies are a diverse group. They play significant roles in both ecosystems and human health. Certain species, like mosquitoes (Culicidae), are notorious vectors for diseases such as malaria, dengue, West Nile virus, and yellow fever, making them a major medical and economic concern worldwide.

Female flies lay eggs close to food sources, ensuring their larvae have immediate access to nutrition upon hatching. Development occurs quickly, allowing larvae to consume as much food as possible before transitioning into adult flies. In some cases, eggs hatch immediately, while a few species are ovoviviparous, with larvae hatching inside the mother before emerging.

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This rapid lifecycle, combined with their ability to transmit diseases, makes flies a persistent and serious pest problem. Proper control measures are essential to manage their impact effectively.