A dot matrix is a type of printer that creates images and text by striking an ink-soaked ribbon against paper using a grid of tiny pins. Each pin can be activated individually, forming dots that combine to create characters and graphics. This technology was widely used in the past for printing invoices, labels, and multi-part forms. Dot matrix printers are known for their ability to print on multi-layer forms, making them useful in business environments. While they have largely been replaced by more modern printers like inkjet and laser printers, they are still valued for their durability and low operating costs.