There will be three (3) sets of seven (7) judgments from God unto the world after the Rapture.
There are different views of when the judgment will occur.
The first 14 judgments will occur during the first 3 1/2 years of the Tribulation and the last seven will occur during the last 3 1/2 years of the Great Tribulation.
Each judgment will be followed by increasingly worse judgment.
The last (21st) judgment will be followed by the the Second Advent/Coming of our Lord Jesus Christ with His Bride - The Revelation of Jesus Christ as King.
Many ask, "Why concern ourselves with this part of prophecy? We'd be gone by then in the Rapture.
" We need to concern ourselves with this because the seven year tribulation will be the most debased time that human history has ever known.
Many of the people we know will go through this period.
It will be worse than anything imaginable.
It will be outright horror.
Hollywood cannot even create, let alone put on film, the unspeakable magnitude of the hellish global reign of terror that is about to breakout on the world.
If we follow what Jesus commanded us to do, "love our neighbors as ourselves" then we would be motivated to evangelize even more to the lost before Jesus calls us to Himself.
The first four seals introduce the Four Horsemen of the Apocalypse - the first is the Anti-Christ, the second is war, the third is famine and the finally, the forth is plague.
Plague also brings fresh famine and war.

• First Seal JudgmentRevelation 6:1, 2: The first of the well known "Four Horsemen of the Apocalypse" appears.
  Who is this figure? The Anti-Christ.
  His purpose? He will be bent on conquering and introducing a one world government.
  If you look closely to current world events, you will notice the birthing of a one world government .
  
• Second Seal JudgmentRevelation 6:3, 4: This second horseman of the Apocalypse is symbolic of war.
  In his effort to conquer the world, the Anti- Christ will cause nations to come against him.
  This is the start of the next world war.
  
• Third Seal JudgmentRevelation 6: 5, 6: "Black" is the symbol for famine.
  It's been used before in Scriptures to depict famine (Jeremiah 4:28 , Lamentations.
  4: 8, 9) Famine often follows war as it did in World War One, especially in Germany.
  However, go back in history just before World War One and study the effects of the Stock Market Crash of 1929.
  Many lost their jobs and wealth and inflation was rampant? History book have images of Germans buying one loaf of bread for a wheel barrel full of money.
  What we are seeing in the Third Seal Judgment that a "penny" is the equivalent of a day's wages after the war.
  Bread and wheat will cost a day's wages in those times.
  The oil and wine is symbolic of the rich.
  This war will take it's toll only on the common people and not the rich.
  
• Fourth Seal JudgmentRevelation 6: 7, 8:The corpse-like pale horse is Death.
  The death rate will be high in the first twenty-one months of the Tribulation.
  People will die as a result of the war, famine and inflation.
  In fact, one fourth of the population of the earth will die.
  Notwithstanding, it will only be the unsaved that will suffer.
  Why? ...
  and Hell followed with him.
  Tribulation Christians will not suffer through God's wrath.
  
• The Fifth Seal JudgmentRevelation 6: 9 - 11: A multitude of Tribulation Christians will be persecuted and slain at this time; that is, Christians that are saved after the Rapture.
  These are the multitudes referred to in Revelation 7:9.
  This will be the greatest persecution of Christians the world has ever known.
  This period will make all the past periods of Jewish and Christian persecution look like a lazy Sunday afternoon at Disney World.
  The Lord hears His Saint's cry for justice.
  He delivers justice in the form of the sixth seal, along with the trumpet and bowl judgments.
  
• Sixth Seal JudgmentRevelation 6: 12 - 17: Earth will suffer a phenomenal earthquake, meteors fall from the sky and cosmic disruptions occur.
  This is God's payment to the wicked for the slaughter of His Saints.
  The wicked will know that it is in fact Lord Jesus who is judging them - there is no where to hide from His wrath (Revelation 6:15-17).
  These six seals are the introduction to even greater, more horrific events to come.
  
• The Seventh Seal JudgmentRevelation 8: 1: The seventh seal depicts the calm before the storm.
  This seal introduces the second set of seven judgments called The Seven Trumpet Judgments.
  These trumpet judgments are so horrendous that all heaven sits in awesome silence before the judgments begins.