The Flight Controller (FC) is one of the most important component in your drone - is the heart of all Multirotors. FC gives stabilization and drone controling. FC consist a circuit board with sensors detected orientation changes of your quadocopter. On the other hand it allows you control the motor and keep the drone in the air. Gyrposcopes (Gyro) and Accelerometer (Acc) are the basic sensors using in FC. Some FC might include additional functions like GPS, LED, Barometer or Compass. Choosing the FC for your drone depends on what type of flying you intend to. FPV Freestyle, Racing Drones, Camera Drones require different FC.