Parallel ports are easy to program and faster with the RS-232 interface(serial port). But the disadvantage is that they need a series of gears. Because of this reason the parallel ports are not included in the distance. Tell us the fundamental difference between the work of the parallel and serial port.
In the serial interface, there are two lines of data transmission and a line to receive. To send data to a serial port, there must be a little after the other with additional start-bit, stop bit and parity bit for detect errors.
But at the same time every 8 bits in a byte is sent to the port at a time and an indication is in a different line. It is supported by the data, some control and some handshaking lines in parallel port. If three data bytes 01000101 10011100 10110011 in the harbor, the parallel communication is faster than the serial interface.
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