What does the term 'frame rate' refer to in video production?

Frame rate in video production refers to the speed at which frames are displayed on the screen, typically measured in frames per second (fps). This metric is crucial because it determines how smooth and fluid the motion appears in video playback. Higher frame rates can result in smoother motion, which is particularly important for fast-paced content, such as sports or action sequences. Conversely, lower frame rates can create a more choppy appearance, which might be used for stylistic effects or to evoke certain moods.

The other choices provide different aspects of video production but do not define frame rate. The resolution pertains to the clarity and detail of the video image, the length is related to the duration of the entire video, and the number of audio tracks concerns the audio component rather than the visual aspect of video playback. Understanding frame rate is fundamental for video creators to effectively convey motion and maintain the desired aesthetic of their projects.