Exposition (narrative)
BACKGROUND INFORMATION WITHIN A NARRATIVE; ONE OF FOUR RHETORICAL MODES
Plot exposition; Incluing; Plot dump; Infodump; Expository; Exposition (plot device); Exposition (fiction); Expositional Dialogue; Information dump; Exposition (literary technique); Plot dumping; Exposition dump; Info dump; Info-dump; Indirect exposition; Narrative exposition
Narrative exposition is the insertion of background information within a story or narrative. This information can be about the setting, characters' backstories, prior plot events, historical context, etc.