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The difference is that serial transmissions only use 2 wires for transmitting and receiving data, and only 1 for sending or receiving, and can only send one bit at a time. Parallel cables use several wires for data transmission and is much faster than serial thus 8 or more wires are carrying data *parallel* to each other to it's destination. serial data

data (8 bits)

transmit -----------010101010-----------------> single line to transmit on

receive <--------------------------- single line to receive on Parallel data (80 bits)

transmit multiple lines simultaneously

---- 010101001----------->

-----------010101010----------->

-----------010101010----------->

-----------010101001----------->

-----------010101010----------->

-----------010101010----------->

-----------010101001----------->

-----------010101010----------->

-----------010101010----------->

-----------010101001----------->

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