Revelation is the final word of revelation through inspired Scripture. Just as Genesis is the beginning, Revelation is the end. Revelation begins with the Dispensation of the Church (ch.1-3), the Tribulation of Israel (ch.6-19), the Millennial Reign of Jesus Christ (ch.20), and the Dispensation of the Fulness of Times (ch.21).
The Greek manuscripts are variously titled Revelation of John, or more properly Revelation of Jesus Christ (Rev. 1:1). In English, the Book is often simply shortened to Revelation, or sometimes referred to as the Apocalypse.
The Apostle John, son of Zebedee, at nearly 100 years of age.