What method of beginning a story reveals backstory right away?

One effective method of beginning a story that reveals backstory right away is the use of a prologue. In a prologue, the author can provide essential background information or set the stage for the main narrative, giving readers context about characters, events, or settings. Another approach is to start with a flashback, allowing characters to reflect on past experiences that shape their current motivations and conflicts. Both techniques engage readers while providing necessary context.