Satan
means "adversary." Satan is the enemy of God. He wants to destroy everything God has created. He is also called "the devil" (James 4:7), "the evil one" (1 John 5:18-19), "the prince of this world" (John 14:30) and "the god of this age" (2 Corinthians 4:4).
Satan brought evil into the world. He lies, destroys and attacks the people of God.
Jesus came into the world to renew what Satan had destroyed. Satan tried to stop Jesus. But Jesus is God's Son, and he has more power than Satan.
The followers of Jesus can resist Satan by asking for the power of the Lord.
God will one day win a complete victory over Satan.