Frame rate (expressed in frames per second or fps) is the frequency/speed (rate) at which consecutive images called frames appear on a display.
The term applies equally to film and video cameras, computer graphics, and motion capture systems.
Frame rate may also be called the frame frequency, and be expressed in hertz.
Note that: <MATH> 1 \text{Hertz} = 1 \text{Frames Per Second} </MATH>
The number of frames that is displayed each second has a direct impact on how smooth (life-like), a video (or user interface) seems to be.
For instance:
humans perceive individual images as motion with frame rates: