A quadcopter is a type of unmanned aerial vehicle (UAV) that is powered by four rotors and is capable of vertical takeoff and landing (VTOL). It is also known as a quadrotor or quadrotor helicopter. Quadcopters are commonly used for various applications such as aerial photography, videography, surveillance, mapping, and various research purposes. They are highly maneuverable, stable, and relatively easy to control, making them popular for both hobbyists and professionals. Research in this area focuses on improving the efficiency, stability, maneuverability, and safety of quadcopters, as well as developing new applications and technologies for their use in various fields. Additionally, research is also conducted on optimizing the design, control algorithms, and sensor integration of quadcopters to enhance their performance in different environments and tasks.