For years and years God's people waited for the Messiah. They longed for him to come and do everything God had promised. They waited and waited.
However Christians believe that the Special One had already been chosen. They believe he had always been chosen.
The Bible teaches that God chose his son Jesus to live among people and do all the promised special things. In the Bible we read that some people who met Jesus did not think he was the Chosen One because he was nothing like they had imagined - he was not a soldier or a king like King David. But many people did believe - they believed Jesus was the Messiah, the one they had been waiting for.
Christians today believe Jesus is the Messiah. They believe he is the Chosen One God sent to live with people.
The word ‘Christ’ and the word ‘Messiah’ have the same meaning which is why Christians call Jesus ‘Jesus Christ’.