DCB: Defenitly a much shorter version of explaining it! 
I disagree about it being "optional". Maybe the Arduino bootloader can be, but then it isnt an Arduino anymore, but an Atmel microcontroller, so to speak 
DCB: Defenitly a much shorter version of explaining it! I disagree about it being "optional". Maybe the Arduino bootloader can be, but then it isnt an Arduino anymore, but an Atmel microcontroller, so to speak