What is the judgment seat of Christ?
The judgment seat of Christ is where every believer, immediately after being caught up in the rapture, stands before Christ to have their works in the body reviewed and rewarded, while those raised later in the second resurrection stand before Him for judgment of their evil deeds.
Scripture teaches that every soul will one day stand before the judgment seat of Christ. Immediately after the rapture, those who are caught up to meet the Lord will appear before Him so that the good works done in their bodies can be reviewed and rewarded. Second Corinthians 5:10 makes this plain: "For we must all appear before the judgment seat of Christ; that every one may receive the things done in his body, according to that he hath done, whether it be good or bad." Revelation 22:12 and Matthew 16:27 confirm that Christ comes with reward in hand to give every man according to his works.
The first place the raptured Church arrives before the Lord is described as a sea of glass mingled with fire, where those who overcame the beast, his image, his mark, and the number of his name stand with harps of God. This is the fire that tries the believer's works, the souls won, the ministry that edified others, and the lives delivered through obedience. Only labor that has truly borne fruit stands revealed here; work without fruit simply does not appear in this judgment at all.
First Corinthians 3 describes this in the language of building: gold, silver, and precious stones survive the fire and bring reward, while wood, hay, and stubble are burned up. If a believer's work abides, a reward is received; if it is burned, the believer suffers loss of reward yet is still saved, though "as by fire." So the judgment seat of Christ for the saints is not about salvation, which is already secure, but about the manifestation and reward of works done after coming to Christ.
By contrast, those who are not part of this first resurrection but are raised later, in the resurrection of the wicked, will also stand before Christ, but for judgment concerning the evil deeds committed in their bodies. In this way the judgment seat of Christ covers both the rewarding of the righteous for their labor and, at a later resurrection, the reckoning of the wicked for their deeds.
The scriptures
For we must all appear before the judgment seat of Christ; that every one may receive the things done in his body, according to that he hath done, whether it be good or bad.
And, behold, I come quickly; and my reward is with me, to give every man according as his work shall be.
For the Son of man shall come in the glory of his Father with his angels; and then he shall reward every man according to his works.
And I saw as it were a sea of glass mingled with fire: and them that had gotten the victory over the beast, and over his image, and over his mark, and over the number of his name, stand on the sea of glass, having the harps of God.
I have planted, Apollos watered; but God gave the increase. So then neither is he that planteth any thing, neither he that watereth; but God that giveth the increase. Now he that planteth and he that watereth are one: and every man shall receive his own reward according to his own labour. For we are labourers together with God: ye are God’s husbandry, ye are God’s building. According to the grace of God which is given unto me, as a wise masterbuilder, I have laid the foundation, and another buildeth thereon. But let every man take heed how he buildeth thereupon. For other foundation can no man lay than that is laid, which is Jesus Christ. Now if any man build upon this foundation gold, silver, precious stones, wood, hay, stubble; Every man’s work shall be made manifest: for the day shall declare it, because it shall be revealed by fire; and the fire shall try every man’s work of what sort it is. If any man’s work abide which he hath built thereupon, he shall receive a reward. If any man’s work shall be burned, he shall suffer loss: but he himself shall be saved; yet so as by fire.
From the books
This answer is drawn from these passages in the Mary Banks Faith Library.