In days of old, God spoke to mankind through the prophets.  In the fullness of time however, God chose to deal with mankind face to face; He did this by sending His son Jesus into the world to become a man; not just any man however, but rather God-man (fully God, fully man.)  His purpose in coming was to

destroy the works of the Devil and to reconcile fallen mankind to God.  His birth was also unique in that it was unlike any other birth, it was a miraculous birth.  To learn more about Jesus' birth, please CLICK HERE.