Christian eschatology is the study of what would happen at the end of the world according to the Bible. Christians believe that Jesus will return one day to bring an end to this world and to create a new world. The Bible teaches that when Jesus returns, He will judge all the people in the world based on how they lived their lives. People will receive rewards or punishments based on how they treated others. They also believe that the people who have been faithful to God will go to heaven when Jesus returns. So, Christian eschatology is about what Christians believe will happen when Jesus returns.