It contains an account of the author, named John in the text, who saw a vision describing future events at the end of the world, involving the final rebellion by Satan, and when God would defeat Satan once and for all and restore peace to the world.
It is definitely one of the most controversial books of the Bible, with many ranging interpretations of the meanings of the various names and events in the account.
The identity of the author John is not completely clear. A traditional view is that the author of this book was John the apostle, but other scholars doubt that. The Traditional view of John is that he also wrote the Gospel of John and I, II, and III John.
Traditionally the date of the writing of this book has generally been fixed at A.D. 96, in the reign of Domitian. Others contend for an earlier date, A.D. 68 or 69, in the reign of Nero. Those who are in favour of the later date appeal to the testimony of the Christian father Irenaeus, who received information relative to this book from those who had seen John face to face. He says that the Apocalypse "was seen no long time ago."
See also Christian eschatology.