B-roll
B-roll is supplementary footage cut in alongside the main footage, such as an interview, in film and video production.
B-roll refers to footage that supports the main material of a film or video, known as A-roll. It typically shows places, objects or actions related to what a speaker is saying, and editors use it to illustrate a point visually or to smooth transitions between cuts.
The term comes from A and B roll editing in film, in which two reels of film were alternated during editing. B-roll is widely used in documentaries, news reports, interviews and online video.
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