In serial and parallel comunication,serial comunication is 
most useful and helpful because of in serial communication 
the transmission speed high.


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There is a trade off in serial and parallel communicaton. 
Parallel communication is faster than serial communication 
but it requies lot of hardware. Parallel communication is 
less used than serial which requires less hardware and easy 
to implemen.

Serial Communication no matter is high speed ex if u want to
transmit 8 bits of data serially it requires 8 clock cycles
and receiver has to wait 8 clock cycles to process the data.

So processing data will be slow.Less hardware is req.

Where as in parallel transmission all 8 bits are available
in single clock cycle so processing time is fast.More
Hardware is req to implement

The conclusion lies on transmission and processing time you
have to choose according to the application

In series communication, the communication system are 
connected in series , so that the data is communicated 
series so it is very slow, but parallel communication 
system are connected parallely so that it is easily 
communicated.

The serial communication is effective then the parallel, 
because serial used for long distance. if we use parallel 
commu for long distance means i) the cost is increasse ii)
capacitance also increase, because of it data lose will 
occour.