What is a storyboard

A storyboard is the first time that a filmmaker is able to physically visualize there ideas in real life and to get it out of there head. It is a graphic representation of how the video will unfold shot by shot.
 A storyboard consists of many frames and shot information below it (often even the part of the script) and also a reference number so that people can refer to it later on.
With a storyboard you are able to share your ideas to others so that everyone is on the same page.
It will actually save you time because it will ensure that you do not miss out on shots, so that you do not need to make revisions later on.
It also solidifies your idea onto paper. 
Overall storyboarding is a integral part of film making because it allows everyone to understand exactly what you are trying to deliver and how, it is almost like a cartoon that allows everyone in the team to be able to execute your vision.