A pixel is the smallest unit of a digital image or display. It is a single point in a raster image, or a collection of data points that are displayed together on a computer monitor or other display device. The term "pixel" is a combination of the words "picture" and "element," and is used to describe the individual points that make up an image. Each pixel in an image has a unique position and color value, and when combined with the other pixels in the image, they create the overall visual effect. The resolution of an image is determined by the number of pixels it contains, and the larger the number of pixels, the higher the resolution and the more detailed the image will appear.