It tells the app who to show your videos to and tells viewers why to follow.
“Cooking” is a topic. “15-minute dinners for night-shift workers” is a niche.
Going so broad that nobody feels spoken to, or so narrow you run out of ideas in a month.
How to use it
Test a niche by writing 30 video ideas for it. If you can’t, it’s too narrow or not interesting enough to you. If the ideas could be for anyone, it’s too broad. A good niche usually combines a topic, a specific viewer and your angle: what you know, have or do that most people making videos about it don’t.