Topic summary
Data Transfer
Extracted from the Wikipedia article Data communication.
Serial and parallel transmission
Parallel transmission is the simultaneous transmission of related signal elements over two or more separate paths. Multiple electrical wires are used that can transmit multiple bits simultaneously, which allows for higher data transfer rates than can be achieved with serial transmission. This method is typically used internally within the computer, for example, the internal buses, and sometimes externally for such things as printers. Timing skew can be a significant issue in these systems because the wires in parallel data transmission unavoidably have slightly different properties, so some bits may arrive before others, which may corrupt the message. This issue tends to worsen with distance, making parallel data transmission less reliable for long distances.