Flies are small, winged insects belonging to the order Diptera. They have a pair of wings and are known for their ability to fly quickly and change direction rapidly. Flies are found in various environments around the world and play important roles in ecosystems, such as pollination and decomposition. The most common type of fly is the housefly, which is often found in homes and can be a nuisance. Flies have a short life cycle, typically living for a few weeks, and they reproduce quickly. Their diet mainly consists of decaying organic matter, which helps recycle nutrients in the environment.