Video editing is a long process, which involves alter rating large sections of video data.
The tape may be hours long but the finished version could be edited down to only a few minutes. The editor mixes and matches video frames and clips, found in every video. It is up to the editor to decide what are the best angles and shots to be put in to it and which ones are to be left out. The final commercial version will be made up of these frames and may look completely different to the first version as these clips can also be put in any order to suit. They do not produce the show they merely show the camera views of it.