PLAIN-LANGUAGE DEFINITION
B-roll
B-roll is supporting footage used around the main narrative or spoken explanation.
IN PRACTICE
An example
A close-up of a clasp can support a voiceover explaining how a bag closes.
What this does not tell you
Use footage that accurately represents the product being discussed.
Use the term precisely
When you use this term in a brief or report, include the relevant source, scope and assumptions. An example explains the concept; it is not a benchmark or a promise of results.