Annotated editions are books that include additional notes and explanations alongside the main text. These annotations can provide context, clarify difficult passages, and offer insights into the author's intentions or historical background. They are especially useful for readers who want to deepen their understanding of classic literature or complex subjects. Typically, annotated editions feature footnotes or endnotes that reference specific lines or sections of the text. This format is common in works by authors like William Shakespeare or Jane Austen, where readers may benefit from explanations of archaic language, cultural references, or literary devices used in the writing.