Ink-jet is a term commonly used to refer to a type of printing technology that creates digital images and texts by spraying microscopic droplets of ink onto paper or other printing media. However, there are several synonyms that can be used to describe this technology, including digital printing, drop-on-demand printing, and piezo printing. Digital printing refers to the use of computer-generated images to create printed materials. Drop-on-demand printing describes the technology that only produces ink droplets when required, thus minimizing waste. Piezo printing refers to the use of a piezoelectric material to generate the ink droplets necessary for printing. These synonyms help to describe the many variations of ink-jet printing available.