Quadcopters are a type of multirotor unmanned aerial vehicle (UAV) that has four rotors. Quadcopters have become increasingly popular among hobbyists, researchers and commercial users in recent years due to their ease of use and low cost. Quadcopters are capable of hovering in one spot, making them ideal for tasks such as surveillance, photography and search and rescue operations. They can also carry out missions that would otherwise be difficult or impossible for other types of UAVs. Furthermore, quadcopters are more maneuverable and can fly at higher altitudes than other types of UAVs. This makes them well suited for applications such as mapping, surveying, and emergency response operations. All in all, quadcopters offer a unique and highly efficient platform for many applications and should continue to be a popular choice among hobbyists, researchers and commercial users.