A prologue is an introductory section of a book or play that sets the stage for the story to come. It often provides background information, introduces key themes, or presents important characters. By giving readers a glimpse of what to expect, a prologue can create intrigue and prepare them for the unfolding narrative. In literature, prologues can vary in length and style, but they usually aim to engage the audience's interest. For example, in Shakespeare's plays, prologues often summarize the plot or highlight central conflicts, helping the audience understand the context before diving into the main action.