Resolution refers to the number of pixels that can be displayed on a screen and is expressed as the horizontal by vertical count, such as 1920x1080 for 1080p. Higher resolutions allow for more pixels and clearer images, with common formats including 4K, 2K, 1080p and 720p. Audio resolution similarly refers to sampling rates higher than the CD standard of 44.1 KHz to allow for higher quality music encoding and playback.