Technology & Units
What Is Pixel?
A pixel is the smallest controllable dot of a digital image or display; resolution is measured in pixel dimensions like 1920×1080.
A pixel (picture element) is the smallest addressable unit of a digital image or screen — a single dot that displays one color at a time. Images and displays are measured in pixel dimensions: a 1920×1080 (Full HD) screen contains about 2.07 million pixels.
Pixels have no fixed physical size; a 27-inch and a 5-inch display can share the same resolution with very different sharpness. That density is measured in PPI (pixels per inch), and print equivalents in DPI (dots per inch), with 300 DPI the standard for quality printing.