'Simplex' and 'Duplex' refer to a printer's capability to print on both sides of a sheet of paper. A duplex printer has a unit attached to it that after printing the odd page turns the sheet upside down and resubmit it to print the even page, thus printing two pages on one sheet; this can save a lot of paper.
A simplex printer simply outputs the sheet of paper after printing a page, but this doesn't mean that it cannot print on both sides as well, although not automatically.
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