Dots per inch: refers to dots of ink on a printed page and thus to the output resolution of a print device. It is often used in error, in place of PPI (pixels per inch), which is a property of an image file or a display device.

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What DPI should be used for what situations?

I've been seeing the word 'DPI' pop up quite a lot when I export my work out in Photoshop and Illustrator. While I know that DPI stands for 'dots per inch', and that if you have too low of a DPI on an ...