Since the ATmega328PB was released, it has proven to be a better and cheaper MCU for manufacturing than the ATmega328P ... phone charger). The Arduino Nano uses a bootloader for handling ...

What makes an Arduino an “Arduino” and not just an AVR is the bootloader. Thus: An Atmega328P is an AVR processor. An Atmega328P with the Arduino bootloader is an Arduino. The bootloader ...