Exposition

Information the audience needs — backstory, rules, context — and the craft of hiding its delivery.

Exposition is necessary cargo: who these people are, how the heist works, what the prophecy says. The failure mode is delivering it as delivery — two characters telling each other things they both already know ('As you know, brother…').

The classic solutions: make someone need the information now, attach it to conflict, or make the audience want it before you hand it over. Information that costs a character something to reveal never feels like exposition.