Culicidae, commonly known as mosquitoes, are small flying insects belonging to the order Diptera. They are characterized by their slender bodies, long legs, and elongated mouthparts, which they use to feed on the blood of various animals, including humans. There are over 3,500 species of mosquitoes worldwide, and they thrive in warm, humid environments. Mosquitoes play a significant role in ecosystems as both pollinators and prey for other animals. However, they are also known for transmitting diseases such as malaria, dengue fever, and Zika virus, making them a major public health concern in many regions.