Satan is a real person. He is a rebel angel, a spirit creature who opposes God. The Bible calls Satan “the ruler of this world.” (John 12:31) He uses “lying signs” and “deception” to accomplish his aims.—2 Thessalonians 2:9, 10.
The Bible records a conversation in heaven between Satan and God. If Satan were a mere symbol of the evil that exists inside each person, how could God, who is perfect and morally unblemished, have been talking to an evil part of himself? (Deuteronomy 32:4; Job 2:1-6) Clearly, Satan is a real person and not merely a personification of evil.