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The quality of an image and how well it reproduces. In printing, it refers to the number of Dots Per Inch (DPI) printed on a page. Generally, the more dots per inch, the better quality the image. In websites, it refers to Pixels Per Inch (PPI) on the screen.
use it in real life: Designers working in print are always wanting "hi-res" or high resolution image files because printing requires resolution or more dots per inch (DPI) to make it appear sharp and in focus than an on-screen image. Printing requires 300 DPI vs 72 PPI or Pixels per inch for monitors, TVs or other screens.