From its Greek roots, epilogue means basically "words attached (at the end)". An epilogue often somehow wraps up a story's action, as in the one for a famous Shakespeare play that ends, "For never was a story of more woe / Than this of Juliet and her Romeo". In nonfiction books, we now often use the term afterword instead of epilogue, just as we now generally use foreword instead of prologue. Movies also often have a kind of epilogue--maybe a scene after the exciting climax when the surviving lovers meet in a café to talk about their future. The epilogue of a musical composition, after all the drama is over, is called the coda (Italian for "tail").