174. Why is the Church apostolic?

The Church is apostolic in her origin because she has been built on "the foundation of the Apostles" (Ephesians 2:20). She is apostolic in her teaching which is the same as that of the Apostles. She is apostolic by reason of her structure insofar as she is taught, sanctified, and guided until Christ returns by the Apostles through their successors who are the bishops in communion with the successor of Peter.

Further reading: CCC 857,869

175. In what does the mission of the Apostles consist?

The Word "Apostle" means "one who is sent". Jesus, the One sent by the Father, called to himself twelve of his disciples and appointed them as his Apostles, making them the chosen witnesses of his Resurrection and the foundation of his Church. He gave them the command to continue his own mission says, "As the Father has sent me, so I also send you" (John 20:21); and he promised to remain with them until the end of the world.

Further reading: CCC 858-861

176. What is apostolic succession?

Apostolic succession is the transmission by means of the sacrament of Holy Orders of the mission and power of the Apostles to their successors, the bishops. Thanks to this transmission the Church remains in communion of faith and life with her origin, while through the centuries she carries on her apostolate for the spread of the Kingdom of Christ on earth.

Further reading: CCC 861-865