Information exchanged between characters who know one another. Compare to stranger exposition (below). The concept here is that characters who already know each other often can’t be used to deliver backstory/exposition, because they already know this information and wouldn’t explain it to each other. Two people who know one another don’t have to reiterate information which they both know. You don’t have to say to your father, “Hey, Dad, have you heard from my sister Stella, your youngest daughter?” or “Dad, we’re having a Fourth of July party to celebrate the Fourt of July, which is a national holiday which falls on the Fourth of July, the anniversary of the signing of America’s Declaration of Independence.”
