The Roman Catholic Church stands or falls on the doctrine of apostolic succession. It is from this doctrine that the Church claims its supreme authority. Now, the Roman Church is not the only church to believe this doctrine, but they are the only church to claim unique and complete authority from it. The Catholic apologetic website, Catholic Answers says that the Roman Church, unlike ‘separate’ churches, can lay claim to being the true church by means of apostolic succession. What is apostolic succession? Apostolic succession is the idea that bishops in the Roman Church are the successors of the apostles to whom Jesus gave the authority, to go into all the world and preach the gospel. It presupposes that the original twelve apostles ordained others to be apostles through the laying on of hands. In doing this, they conferred upon them the same authority they had been given. These apostles (bishops) then ordained others, who in turn ordained others, who in turn… well you get the idea.
The Official Blog of Reachout Trust: Christian writing on Cults, Religions, Apologetics, Bible Teaching