A microcontroller is a small computer, and usually *System on the Chip* (SoC), which include a processor core, memory unit and programmable input/output unit. The most famous family of microcontrollers is **AVR** or **Advanced Virtual RISC** family. This family of microcontrollers are used in boards such as [Arduino](http://arduino.cc), and they're used for industrial and educational purposes. A microcontroller, can control a toy car, and it also can control a US army drone. And this depends on microcontroller type, and the program we write for it.
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