This book is THE Revelation given to Jesus Christ from God the Father which Jesus Himself “signified” to John. Signified here means render into signs or make symbolic.  It is a book of prophecy that outlines all history in advance from the time of the writing until the end of time itself.  The main message is a culmination to the entire story of the bible.  What started in Genesis is completed in Revelation, like two bookends around the message of redemption for the fall of humanity. In Revelation, Jesus Christ defeats Satan and establishes an eternal loving relationship with all the believers, returning the universe to the pre-fall state of the Garden of Eden.