What does the Bible say about the dragon in Revelation?

In Revelation 12, the dragon symbolizes Satan, depicted as a powerful adversary who opposed God and His plans throughout history. The passage describes a war in heaven, where Michael and his angels fight against the dragon and his angels. Ultimately, the dragon is defeated and cast out of heaven, emphasizing the sovereignty of God in the cosmic battle between good and evil. Consequently, the dragon's removal signifies the victory of God's salvation through Christ, as believers are assured that they overcome by the blood of the Lamb and their testimony.