Satan will be bound for 1000 years. His
power and influence is removed.

Satan (the Devil) was a high angelic being
called "the anointed cherub" who covered
the throne of God (Ezekiel 28:11-17 and
Isaiah 14:12-17). He rebelled and became
the main opposer of His creator God.

He will be bound during Jesus' millennial
reign and then loosed for a short time
before his final doom.