Flies are small, winged insects belonging to the order Diptera. They have a single pair of wings and are known for their rapid flight and ability to change direction quickly. 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 human habitats. Flies have a short life cycle, typically ranging from a few weeks to a couple of months, depending on the species and environmental conditions. They are known for their ability to reproduce quickly, leading to large populations in suitable environments.