Inkjet printers form graphic images and characters by spraying tiny liquid ink drops onto sheets of paper. An inkjet printer's print head mechanism contains ink-filled cartriges, each of which has tiny ink nozzles. Ink is propelled through a combination of nozzles to form a printed image or character on paper. Most inkjet printers feature a black ink cartrige and one or more color ink cartriges. Compare and shop for OEM and compatible printer ink cartriges.