Data are transmitted along a communication either in serial or in parallel mode.
Serial Transmission: In serial transmission, the bits of each byte are sent along a single path one after another. An example is the serial port (RS-232) for the mouse or MODEM.
Advantages of serial transmission are :
It is a cheap mode of transferring data .
It is suitable to transmit data over long distance.
The disadvantage is :
This mode is not efficient (i.e. slow) as it transfers data in series .
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