Most people heard the term DPI. In most cases the term is used in the wrong context to express the number of pixels in a photo, the number of dots in a print or the maximum dots per inch a printer can output. A relatively new term PPI was introduced in order to resolve this wrong usage of the term DPI https://xn--bp2bm1qvxl.cc/%ec%9e%91%ec%97%85%ec%9d%b8%ec%a6%9d/