E89 Q99 Why is the Church called “apostolic”?

An apostle is one who is sent. The Church is called “apostolic” because it holds the faith of the first apostles sent by Christ. In continuity with them, the Church is likewise sent by Christ to proclaim the Gospel and to make disciples throughout the whole world. (Matthew 10:1–4, 40–42; 28:18–20; Acts 2:42; 13:1–4; Ephesians 2:19–21)

Download the Catechism here