What is the mark of the beast? Is it a tattoo or a barcode or a chip implanted in the hand as many believe, or is it something else that is far more important than that? The book of Revelation reveals exactly what the mark of the beast is in contrast to the seal of God. Every individual can fall in one of two camps: those who receive the mark of the beast and those who receive the seal of God. It is important to understand this issue so we are not found on the wrong side.