What is the Great Tribulation?

Let's go to the question of those Jews who will survive what is called the "great tribulation"; that is, those who will enter into the Kingdom Age and reign with the Messiah, following the Battle of Armageddon, wherein God destroys the armies of the antichrist. If you do not yet understand the tribulation, you will. You may believe the Messiah is coming to set up His Kingdom and to restore Jerusalem. He is! But first comes the tribulation.