Hook
Definition
The opening few seconds of a video, engineered to stop the scroll and make viewers keep watching.
The hook is the first few seconds — the most important part of any video. A good hook promises a specific payoff, poses a question the viewer needs answered, or opens a loop the rest of the video closes.
Generic intros ("In this video, we will…") kill retention; cut them. On Shorts you have about one second. See AI script writing.