Prologue
A prologue or prolog (from Ancient Greek πρόλογος prólogos, from πρό pró, "before" and λόγος lógos, "speech") is an opening to a story that establishes the context and gives background details, often some earlier story that ties into the main one, and other miscellaneous information. The Ancient Greek word πρόλογος includes the modern meaning of prologue, but was of wider significance, more like the meaning of preface.