Etymologically the word apocalypse comes from the Greek "apoccalupsis" which means "revelation". It is considered the last book of the new testament where it is written as a prophecy what the world holds in the future. Also called the book of revelations, it is a unique book, considered by experts in literature as a text that is based exclusively on the prophetic, it has a large number of symbolsThat may be a bit complicated to interpret, which is why it has been the subject of many investigations and interpretations throughout history. The Catholic Church grants the authorship of this book to the Apostle Saint John, in addition to considering that this writing belongs to the Holy Scriptures, so they must be accepted and believed as part of Catholic doctrine.
The apocalypse is a book whose literary genre is apocalyptic. Normally this category of texts were used in times of persecution, being a force literature that seeks to provide hope to the persecuted. When this book was written, the Christian people were victims of great persecutions, that is why its content is full of symbols, figures and numbers, so that the persecutors could not interpret it.
In the apocalypse, the use of numbers were used as symbols, for example the number 7 means "perfection", the number 6 denotes "imperfection", since it lacks one of seven, and the maximum imperfection is the six tripled (666) which symbolizes the number of the beast, the number of Evil (Ap. 13-18). Besides being an apocalyptic text, it is also prophetic, its most persistent and fundamental prophecy is that the defenders of good will always be persecuted by evil. But she will always fall before the good, since God will overcome the Evil.
The prophecy says that God will come to make his dwelling place among humanity, and love and peace will reign.