Serial Communication is a protocol in an embedded system for communication between the microcontroller based devices like arduino and raspberry pie to other peripheral devices supporting the serial communication protocol. This protocol is also known as UART or USART(universal asynchronous receiver/transmitter). It follows the UART protocol It is very popular because it uses only two wire for communication the digital pin 0(RX) and digital pin 1(TX).

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The system uses a dedicated serial link, leaving the Arduino's 'main' serial link dedicated to programming the Arduino and communicating with the Arduino Development Environment's serial monitor. But again, it would be trivial to 'move' the serial link to pins D0 and D1, if you wished to.