The AVR is an 8-bit RISC solo chip microcontroller. It is a device used to maintain a voltage to electronic devices. secondly AVR is the ability of a computer or other electronic devices to identify and understand human voice. Most of the Arduino Boards come with AVR controllers. AVR microcontroller can contain peripherals like RAM, EEPROM, Flash memory, Input-Output (I/O) pins, Analog to Digital converters, PWM channels, Timers etc.