Arduino serial communication is one of the many ways Arduino talks to other devices. Arduino uses asynchronous serial communication to send-receive data to and from other devices. Arduino Uno supports serial communication via on-board UART port and Tx/Rx pins. Generally this transmission happens at 9600 bits per second which is termed as baud rate.
Arduino may communicate with many devices including:
Or any device that supports serial communication
How to do it?
In this example we'll connect Arduino and a computer