A pixel, short for "picture element," is the smallest unit of a digital image or display. It is a tiny square or dot that combines with many others to form images on screens, such as those found in computers, televisions, and smartphones. Each pixel can display a specific color, and when viewed together, they create the full picture. Pixels are essential in various fields, including photography, graphic design, and video games. The resolution of an image is often described by the number of pixels it contains, such as 1080p or 4K, which indicates the clarity and detail of the image.