what is ppi

PPI stands for Pixels Per Inch, a measure of pixel density used to define the resolution of digital displays or printed images. It represents the number of pixels contained within a one-inch span of a screen or printed medium. A higher PPI value indicates greater detail and sharpness, as more pixels are packed into the same space. This metric is crucial in evaluating the quality of screens, such as smartphones, monitors, and televisions, as well as printed images where clarity and detail are essential. For example, displays with a PPI above 300 are considered "retina" quality, meaning the human eye struggles to discern individual pixels at normal viewing distances. Understanding PPI is important for designers, photographers, and consumers to ensure the optimal visual experience, balancing resolution with screen size or print dimensions. It plays a significant role in modern technology, influencing user satisfaction and content presentation.