From Wikipedia: "Radio control (often abbreviated to R/C or simply RC) is the use of radio signals to remotely control a device. The term is used frequently to refer to the control of model vehicles from a hand-held radio transmitter. Industrial, military, and scientific research organizations make use of radio-controlled vehicles as well."

For me: FUN! LOTS OF FUN :-) 

Because RC is a great mixture of science, engineering and programming. I can design, build and operate my own creations.

My quadcopter builds, pictures and videos.