The word RAPIO is a Latin word meaning “seized.” The word RAPTURE does not appear in the Bible. It is a term people us to describe the catching up of Christians when Jesus comes back.
Paul said that we will be caught up to meet the Lord in the air (see I Thessalonians 4:17). That is what we call the Rapture of the church. It will happen at the end of this age when Jesus Christ comes back to earth again. As He comes from heaven, we will be caught up to meet Him in the air, and then we will be forever with the Lord.
In the Book of Mark, we read that God alone knows when that time will come.
“However, no one knows the day or hour when these things will happen, not even the angels in heaven or the Son himself. Only the Father knows.” Mark 13:32, New Living Translation