“The term ‘B-roll’ is now limited to secondary footage that adds meaning to a sequence or disguises the elimination of unwanted content . . . Similarly, a contextually irrelevant part of a sentence or anecdote can be removed to construct a more effective, to-the-point delivery. This can also be used to change the meaning of the speaker to fit the view of the producer. In fiction film, the technique can be used to indicate simultaneous action or flashbacks, usually increasing tension or revealing information.” -Wikipedia
Always create more than you could ever possibly use because the strength of a storyteller is not in their ability to create, it’s in their ability to creatively edit. B-Roll is all the footage that is shot that isn’t directly related to the main story. It is the atmosphere or environmental shots, the stuff that gives the action place, form and context.
The more material you have to work with, the more clever you can end up being with the final product.
Above is some B-Roll from the movie Twilight. Don’t judge me…