What is B-roll

https://www.videomaker.com/let-b-roll-be-your-guide/

What is B-Roll?  Why is it important for a project?  What are 3 things to keep in mind when you're shooting B-roll?

    B-roll is additional footage that can supplement your main footage. This is most typically used in documentary filmmaking as your interviews are considered the main footage (or A-Roll) and any cutaways to other footage is typically the B-roll. B-roll is important for a project because it can show the viewer visually what someone is talking about. For example, when someone is talking about doing lab work, showing footage of them or someone doing that type of work can greatly support the idea and help it be more interesting to the viewer. Three things to keep in mind when you're shooting B-roll is to take notes during interviews, focus the B-roll on your goals, and to use footage that doesn't distract. It is a good idea to shoot your B-roll after interviews so that during them, you can take notes on what they talk about and get shots based on their answers. This will make sure you have footage for the points they make and help produce a more cohesive video. Having your B-roll focus on the goal is incredibly vital for your project as it will affect how the message lands with the audience. The article explains how an instructional video would want B-roll that demonstrates the product whilst a video about retiring officers would want to show off their accomplishments. It is important that your B-roll doesn't distract from your interviews because it will weaken your message and goals. This can occur from having footage that simply doesn't match with the dialogue, which can also be from having shaky footage as well.