Demons

     Demons are considered evil spirits or fallen angels. They tempt men towards sin. Demons fell from grace when they rejected God. Demons are believed to be in hell. The Devil is the chief of all demons. But as men who will be tempted to sin; we should remember that if evil exists, a greater good also exists.

  "In Scripture and in Catholic theology this word has come to mean much the same as devil and denotes one of the evil spirits or fallen angels. And in fact in some places in the New Testament where the Vulgate, in agreement with the Greek, has daemonium, our vernacular versions read devil. The precise distinction between the two terms in ecclesiastical usage may be seen in the phrase used in the decree of the Fourth Lateran Council: "Diabolus enim et alii daemones" (The devil and the other demons), i.e. all are demons, and the chief of the demons is called the devil" http://www.newadvent.org/cathen/04710a.htm