Serial ports provide an easy way to communicate between many types of hardware and your computer.
Serial communication is one of the ways in which Microcontrollers communicate data. In this type of communication, data is transferred bit by bit over a single wire.
For example if a microcontroller 1 is transferring data to another microcontroller 2 in serial form then TXD pin of microcontroller 1 will be connected to RXD pin of microcontroller 2 and data will be transferred from microcontroller 1 to microcontroller 2 in bit by bit manner over a single wire.
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