ppi

This term is a technical specification used primarily in the electronics and printing industries to quantify image sharpness. It describes the physical density of pixels on a screen, where a higher value indicates a finer, more detailed image that is less likely to show individual pixels to the naked eye.

Because it is an abbreviation for a specific measurement unit, it is typically treated as an uncountable noun in technical discourse. It is often used as a standalone value or as a modifier for resolution, and it should not be confused with dpi (dots per inch), which refers to printer ink droplets rather than screen pixels.