What are the key differences between postmillennialism and amillennialism in Christian eschatology?

Postmillennialism and amillennialism are two different interpretations of Christian eschatology. Postmillennialism believes that the world will gradually become more Christianized before Christ's return, while amillennialism holds that there will not be a literal 1000-year reign of Christ on earth. The key difference lies in their views on the timing and nature of Christ's reign before his second coming.