House dust mites are tiny, microscopic creatures that thrive in warm, humid environments, often found in homes. They feed on dead skin cells shed by humans and pets, making bedding, carpets, and upholstered furniture ideal habitats. These mites are not harmful in themselves, but their waste products can trigger allergic reactions in some people, leading to symptoms like sneezing, runny nose, and asthma. Regular cleaning and reducing humidity can help control their population and minimize allergic reactions.