Pixel

Pixel is the smallest unit of programmable colour represented on a digital display. Every photograph, in digital form, is made up of pixels. Higher resolutions mean that there are more pixels per inch (PPI), resulting in more pixel information and creating a high-quality, crisp image. Images with lower resolutions have fewer pixels, and if those few pixels are too large (usually when an image is stretched), they can become visible. The word “pixel” means a picture element. However, the number of pixels is not the determining factor in how good a camera is.