What does the Bible say about good and evil angels?

According to Scripture, angels were initially created as holy beings, but some chose to rebel against God and fell from their original state. This is referenced in Jude, where it discusses angels who did not keep their first estate. The existence of fallen angels, often referred to as demons, is a reality that Christians acknowledge. Good angels, on the other hand, are those who remain faithful to God and fulfill His purposes. They are described as the elect angels who are under Christ’s authority, contrasting with the evil angels who are influenced by Satan. Understanding this distinction helps believers recognize the spiritual battle that exists and the need for reliance on God's strength and protection.