Is Satan, the Devil, a Supernatural Being Fallen from Heaven?

As Christians, we are told that the devilSatanis our greatest enemy. Rebuke the devil, and he will flee! Cast the devil out, and you will be free from your temptation! And even when we speak of our own struggles, we identify Satan as the source of these problemsThe devil has really fought me today. But who or what really is this devil, Satan? Where is he, and how do we actually stop him if we find...