Resolution refers to the detail and clarity of an image or video. In digital imaging, resolution is typically measured in pixels, and the higher the number of pixels, the higher the resolution and the more detailed the image will be. In video, resolution is typically expressed as the number of horizontal and vertical pixels, such as 1920x1080 for Full HD (1080p) video, or 3840x2160 for Ultra HD (UHD) video. In displays, resolution is often measured in pixels per inch (ppi), which indicates how many pixels are contained within a given area of the screen. Higher resolution images and video will generally appear sharper and more detailed, but may require more storage space and processing power to display.