Is purgatory mentioned in the Bible?

Many of us are familiar with the concepts of heaven and hell, but how about purgatory? What is it, really? Is this some space in-between, like a waiting room for sinful souls who haven’t earned a direct ticket to heaven? And if so, how does one end up there? Plus, is it even mentioned in the Bible?

It's a catholic idea. I think they have it from 1 cor 3.

12 Now if anyone builds on this foundation with gold, silver, precious stones, wood, hay, straw, 13 each one’s work will become clear; for the Day will declare it, because it will be revealed by fire; and the fire will test each one’s work, of what sort it is. 14 If anyone’s work which he has built on it endures, he will receive a reward. 15 If anyone’s work is burned, he will suffer loss; but he himself will be saved, yet so as through fire.

Whatever that may mean.

While a direct reference to purgatory is not made, it can be argued that some passages can be interpreted as referring to purgatory. One example includes 2 Maccabees 12:43–45, which makes reference to prayers for the dead.