What is Split Screen?
Two or more things are simultaneously shown at the same time on the screen, they can be a part of the same document or two different documents. Multiple screens can be worked on at the same time.
What is a Split Screen Video?
When it comes to video and film production, split screen is the division of the screen in halves, but sometimes in multiple images. It basically allows one actor to appear twice at the same time. The movie Parent Trap, both the original and the remake, have used this technique. After the advent of digital editing split screen can be achieved easily with the software like WindowsGrid, GridMove, AltDrag, etc.