Satan the devil will be caught by God's angel and bound with a huge chain. Satan will be thrown into what is called a bottomless pit. He will not be able to cause people to sin any more. The evil angels, called demons, that help Satan now, will be thrown into the bottomless pit with him. A seal will be put on Satan and his demons so they will be locked up for a thousand years.
The world will then be without Satan and his demons. Then there will be love and peace.