Resolution
How much detail an image holds, measured in pixels; for print it is expressed as DPI/PPI (dots or pixels per inch), where 300 PPI at final size is the usual standard.
Also called: DPI, PPI, dots per inch
An image’s resolution is simply its pixel dimensions. The catch is output: the same pixels look fine on screen (≈72–96 PPI) but soft in print unless there are enough of them at the final physical size — the print standard is 300 PPI (so a 4-inch card wants ~1200 px across). PPI (pixels per inch) describes the digital file; DPI (dots per inch) describes the printer, though the terms are used interchangeably in everyday work.
For mockups, check the file’s pixel size before promising a client a large print or banner; below-spec source pixels can’t be invented back. Truly scale-free artwork must be vector.