1. JUDGMENT DURING THE TRIBULATION
To bring Israel back to God and because the majority of the world reject Jesus God will pour out His wrath upon the inhabitants of the earth after the Rapture.
God's wrath will consist of several events called judgments.
There will be three sets of seven judgments making a total of twenty-one events involving earthquakes, famine, pestilence, war and much, much more.
Here are the judgments of the Tribulation:

2. 7 SCROLLS
Sealed Scroll Result
First Seal - Antichrist is revealed 6:1-2
Second Seal - World wide war 6:3-4
Third Seal - World wide famine 6:5-6
Fourth Seal - Death of one-fourth of the earth's population 6:7-8
Fifth Seal - Tribulation martyrs in Heaven :9-10
Sixth Seal - Universal upheaval 6:12-17
Seventh Seal - Proclamation of the coming trumpet judgments 8:1-2

3. 7 TRUMPETS Trumpet Judgments Result
First Trumpet - One-third of earth's vegetation destroyed 8:7
Second Trumpet - One-third each of earth's seas polluted, sea life killed and ships destroyed 8:8-9
Third Trumpet - One-third of earth's fresh water polluted 8:10-11
Fourth Trumpet - One-third of the sun, moon and stars darkened 8:12
Fifth Trumpet - Earth's inhabitants tormented by demonic invasion 9:1-12
Sixth Trumpet - Death of one-third of the earth's population 9:13-21
Seventh Trumpet - Proclamation of the Kingdom of God 11:15-19

4. 7 VIALS Vials Judgments Result
First Vial - Sores on worshippers of Antichrist16:2
Second Vial - Remainder of earth's seas turned to blood and all sea life killed16:3
Third Vial - Remainder of earth's fresh water turned to blood16:4-7
Fourth Vial - Sun's heat intensified to scorching16:8-9
Fifth Vial - Darkness and pain upon Antichrist's kingdom16:10-11
Sixth Vial - Euphrates river dried; World-wide military forces gather at Armageddon16:12-16
Seventh Vial - World-wide earthquake and giant hail :17-21