A dot matrix printer or impact matrix printer refers to a type of computer printer with a print head that runs back and forth on the page and prints by impact, striking an ink-soaked cloth ribbon against the paper, much like a typewriter. Printing involves mechanical pressure, these printers can create multiple copies.

Each dot is produced by a tiny metal rod, also called a "wire" or "pin". Manufacturers increased the pin count of the Dot matrix printer printhead from 9 pins to 18, or 24. The increased pin-count permitted superior print-quality.
Dot matrix printer technology remains in use in devices such as Cash registers, Account Statement, Bank telllers, ATM and many other point-of-sales terminals. Some are even fitted with USB interfaces to aid connection to modern legacy-free computers. Dot matrix printers are also more tolerant of the hot and dirty operating conditions found in many industrial settings. The simplicity and durability of the design allows users who are not "computer literate" to easily perform routine tasks such as changing ribbons and correcting paper jams.