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Serial and parallel transmission
There are two methods are used for transferring data between computers which are given below: Serial Transmission, and Parallel Transmission.
Serial Transmission
In Serial Transmission, data-bit flows from one computer to another computer in bi-direction. In this transmission one bit flows at one clock pulse. In Serial Transmission, 8 bits are transferred at a time having a start and stop bit.
Parallel versus serial communication (Wikipedia)
Suggsted Video
Parallel Transmission:
In Parallel Transmission, many bits are flow together simultaneously from one computer to another computer. Parallel Transmission is faster than serial transmission to transmit the bits. Parallel transmission is used for short distance.
Additional Reading
https://www.geeksforgeeks.org/difference-between-serial-and-parallel-transmission/