Final answer:
B-roll is extra footage taken for editing purposes in filmmaking. The director selects the best shots and edits them into the sequence for storytelling.
Step-by-step explanation:
B-roll refers to extra footage taken for editing purposes in filmmaking. During post-production, the director selects the best shots and edits them into the sequence for storytelling. The majority of shots filmed on set do not make it into the final cut.