RX = Receive

TX = Transmit

UART = Universal Asynchronous Receive & Transmit

When there is a byte [0,0,0,0,0,0,0,0], it is sending [LOW, LOW, LOW, LOW, LOW, LOW, LOW, LOW] in very fast manner.

1 byte = 8 bit, that's why computers favour 2^8 = 255

⁉️ MIDI's bytes are inverted!

TTL = Transistor -> Transistor Level

Communication between an Arduino to another Arduino can be mediated with TX-RX, no need computer.

USB can handle one to many, but TX-RX can only do one-to-one.

USB -> Hardware protocol

Sending is easy, receiving... you have to be there to receive it.

FIFO -> First in first out (serial communication)

LIFO -> Last in first out (python's push pop)

println -> send as ASCII, each number is split and each sent as a byte, so if you have 10, you're sending 2 bytes

serial.write(int) -> binary, 10 can be represented with just 1 byte (as long as ur number is 0-255)
serial.write(int + ',') -> ASCII due to the special character / punctuation