It includes prophetic writing and apocalyptic writing.
Visionary writing depicts settings, characters, and events that differ from ordinary reality. The simplest form is a futuristic picture of the changed fortunes of a person or nation. More radical forms transcend earth and describe the supernatural spheres of heaven or hell, are populated by God, saints in heaven, angels, dragons, and monsters. Stars refuse to show their light and hail and fire is mixed with blood.
Visionary literature employs visual scenes, speeches, dialogues, brief narratives, prayers, hymns, and symbolism, and they are organized as a dream or vision. Dreams are momentary pictures, fleeting impressions, characters and scenes that play their brief part then drop out of sight, and abrupt jumps from one action to another. The strange images point to something else, so ask visionary writing, "Of what historical event or what theological fact is this a picture?"
Isaiah 8:5-8 describes a river that would overflow the entire land of Judah, but it is pointing to the imminent invasion by the armies of Assyria. Revelation 12:1-5 describes the unsuccessful attempt of a dragon to destroy a child who is to rule all the nations and who miraculously escapes from the dragon by ascending into heaven, but it points to Satan's inability to thwart Jesus during his incarnate life.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. The Bible as Literature by Leland Ryken, Page 149-150)