Also known as "frame rate"; being a unit used to measure computer and display performance. A frame is one complete scan of the display screen. Each frame consists of a number of horizontal scan lines; each scan line includes a number of pixels on the computer screen. The number of horizontal scan lines represents the vertical resolution and the number of pixels per scan line represents the horizontal resolution of the display. The refresh rate, or the number of times the displayed image is refreshed per second, is measured in frames per second. When video is exported to a QuickTime file, the different formats have different FPS rates. Lower FPS rates produce smaller files. As a measurement of the speed at which pictures (frames) are displayed in sequence in a film or video, the more frames displayed per second, the smoother the motion appears. Full-motion video uses 30 fps or more. See illustration.