Gnats are tiny flying insects that often appear in swarms, especially in warm and humid environments. They belong to various families, including Ceratopogonidae and Mycetophilidae, and are commonly found near water sources, decaying plants, or damp soil. While they can be a nuisance, especially during outdoor activities, most gnats are harmless and do not bite. Some species of gnats, like fungus gnats, are known for their attraction to houseplants, where their larvae can damage roots. Others, such as biting midges, can cause itchy bites. Despite their small size, gnats play a role in the ecosystem by helping with decomposition and serving as food for birds and other predators.