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Write the difference between Dot-Matrix and Laser printer.

The dot matrix printer uses a matrix of needles that press through an inked ribbon to leave marks on the paper. The laser printer uses a roller system to leave charged area on the paper which attracts toner (fine particles of pigment) to stick to the paper. It has been replaced by laser/ink jet and thermal systems which are much quieter – making them more suitable for office and home use.