A DOT matrix printer is a type of printer that uses a print head that moves back and forth, or in an up and down motion, on the page and prints by impact, striking an ink-soaked cloth ribbon against the paper. It is a type of computer printer which is also known as a serial impact printer. It is commonly used for printing multi-part forms such as invoices, receipts, and other documents. The term 'DOT matrix' refers to the pattern of dots the printer uses to form characters and images.