One of the most used industry terms not used outside the video industry is 'b-roll', what is it? Glad you asked!
B-roll is basically any footage that is not an interview or someone talking to the camera. While the 'B' might seem to conotate something of secondary importance, b-roll is actually the creative and eye-catching part of a video, and is what makes a video interesting to look at!
It's also something used to create transitions between scenes and hide 'jump cuts' in editing.
b-roll can be a million things, from timelapses to steady-cam shots, product shots, etc., but the common thread is moving images that help tell the story.