Micro Piezo is the process of putting ink to paper with an electronic bump. Ink being forced through the nozzle of the printhead is shot out similar to the way a squirt gun dispenses drops of water. Thermal Thermal is the technology used by Hewlett-Packard, and other printer brands, where heat is used to force the ink through the nozzle of the printhead onto the paper. Think of the geyser Old Faithful, only smaller. The quality of this output is called the resolution.
Resolution is measured as dots per inch or dpi .
The higher the dpi, the better the resolution. Colors are richer and tones are deeper due to the ability to add more dots per inch. Picoliter Droplet size is another factor in determining the overall output quality. The inkjet industry measures inkjet drops by the industry standard - picoliters . A picoliter is one-millionth the size of a raindrop.