Dots per inch (DPI) is a measure of image printing resolution. In printing, DPI refers to the output resolution of a printer.
DPI definition
Dots per inch is a measure of printing or display screen dot density which denotes the number of individual dots that can be placed in a line within the area of 1 inch (2.54 cm).
The term pixels per inch (PPI) is preferred as a measure of display screen image sharpness as the term DPI is more commonly used with the print medium.
Higher DPI gives better resolution. A common resolution for laser printers is 600 dots per inch.