What does the book of Revelation reveal; and who was John writing to?

Answers:

The book of Revelation is the revelation of Jesus Christ

John was writing to the seven churches in Asia (that existed then)

 Revelation 1:1-3:

1 The Revelation of Jesus Christ, which God gave unto him, to shew unto His servants things which must shortly come to pass; and he sent and signified it by his angel unto his servant John:

Who bare record of the word of God, and of the testimony of Jesus Christ, and of all things that he saw.

Blessed is he that readeth, and they that hear the words of this prophecy, and keep those things which are written therein: for the time is at hand.

John to the seven churches which are in Asia: Grace be unto you, and peace, from him which is, and which was, and which is to come; and from the seven Spirits which are before His throne;

SEE:

Revelation: When did John say things were coming to pass? Who was John writing to? And when was the time referred to that Jesus was returning in the clouds?

Bible: What are the two primary purposes of prophecy for us?

No prophecy of Scripture is of any personal or private interpretation