The curiosity gap deliberately withholds a specific, promised piece of information so that your awareness of the missing piece creates an aversive itch you act to resolve. A message names or gestures at an answer — “the one food nutritionists never eat,” “what happened next shocked everyone” — then blocks access to it.
The move works by pointing at the gap, so you become conscious of a hole in what you know. Awareness of the gap is itself uncomfortable, and the discomfort scales with how close the answer feels. You scratch the itch by clicking, signing up, watching to the end, or paying.
The technique is neutral about whether the withheld payoff is ever delivered — and that is precisely where honest teasing and manipulation diverge. An honest tease closes the loop it opens with something worth the setup; a manipulative one gates a trivial or nonexistent payoff behind an action that serves the sender.