This is a summary of everything the Bible has to say about Satan.
Satan is the prince of demons, and the enemy of Jesus. Also known as the devil, the evil one, the accuser, the tempter, the prince of this world, the ruler of the kingdom of the air, Beelzebul, Belial, etc.
What does he look like?
According to the one verse in the Bible that describes his appearance, the devil is red and has horns. More specifically, he’s an enormous red dragon with seven heads, ten horns, and seven crowns.
Where does he live?
He lives in the city of Pergamum. But he roams all over the earth.
What does he do?
He does bad things. And he causes others (including God!) to do bad things. The devil is the father of lies. He was a murderer from the beginning, and he holds the power of death (or at least he used to).
Does he ever do anything good?
Sometimes Satan pretends to be good, and the Bible mentions him actually doing “good” things at least twice (good according to the Bible, anyway): Paul said that Satan would destroy someone’s flesh so that person’s spirit could be saved. And he said Satan would teach people not to blaspheme.
How powerful is he?
Satan can perform all sorts of signs and wonders to display his power. The whole world belongs to him and is under his control. But he has no power over Jesus, and he can’t harm anyone born of God. With the help of God’s protection, Christians have overcome the evil one. The devil will flee from anyone who resists him.