Pin video allows the host to disable active speaker view and only view up to 9 specific speakers, while other meeting participants can pin one video on their end. It will also only record the pinned videos if you are recording locally (to your computer). Pinning another participant’s video will only affect your local view and local recordings, not the view of other participants and will not affect cloud recordings.
This article covers pinning videos on the Zoom desktop client, but you can also pin videos in Zoom Rooms.
Alternatively, the host can spotlight up to 9 videos. Spotlight video puts a participant as the primary active speaker for all participants. All participants will only see the selected speakers as the active speakers. This feature is often used to spotlight a keynote speaker.