Inkjet, Dot Matrix and Daisy Wheel printers all use ink to output characters or images. Thermal Printers apply heat to thermal paper in order to produce images or characters. Additionally, laser printers (not an option) use toner instead of ink.
Thermal printing (or direct thermal printing) is a digital printing process which produces a printed image by passing paper with a thermochromic coating, commonly known as thermal paper, over a print head consisting of tiny electrically heated elements. The coating turns black in the areas where it is heated, producing an image.Most thermal printers are monochrome (black and white) although some two-color designs exist.
Thermal transfer printing is a different method, using plain paper with a heat-sensitive ribbon instead of heat-sensitive paper, but using similar print heads.