**Serial communication** is the process of sending [data](https://en.wikipedia.org/wiki/Data "Data") one [bit](https://en.wikipedia.org/wiki/Bit "Bit") at a time, sequentially, over a [communication channel](https://en.wikipedia.org/wiki/Communication_channel "Communication channel") or [computer bus](https://en.wikipedia.org/wiki/Computer_bus "Computer bus"). This is in contrast to [parallel communication](https://en.wikipedia.org/wiki/Parallel_communication "Parallel communication"), where several bits are sent as a whole, on a link with several parallel channels.^[https://en.wikipedia.org/wiki/Serial_communication]