The Lay Apostolate refers to the calling and duty of all lay Catholics to actively participate in the Church's mission to save and evangelize the world. This is not just about tasks within the church, but about integrating the Christian faith into everyday life and wider society. In summary, lay apostolate is about living the faith actively and transformatively in the world, not just within the walls of the church, in response to Christ's command to proclaim the Gospel to all people.