The epigraph is generally a quote from someone else's work that you put before your own to create some kind of thematic effect.
An example from the Great Gatsby - "Then wear the gold hat if that will move her; If you can bounce high bounce for her too..." from Thomas Parke d'Invilliers' "Then Wear the Gold Hat". Ironically, Thomas Parke d'Invilliers was a pen name for F Scott Fitzgerald, the author was thus creating an epigraph from his own work produced under pseudonym.
An example from the Great Gatsby - "Then wear the gold hat if that will move her; If you can bounce high bounce for her too..." from Thomas Parke d'Invilliers' "Then Wear the Gold Hat". Ironically, Thomas Parke d'Invilliers was a pen name for F Scott Fitzgerald, the author was thus creating an epigraph from his own work produced under pseudonym.