This comprehensive overview of the Second Vatican Council provides an in-depth look at the history and impact of the most significant event in the history of the Catholic Church. It examines the background of the Council, its major documents, and the changes it brought about in the Church.
From Wikipedia
The Second Ecumenical Council of the Vatican, commonly known as the Second Vatican Council or Vatican II, was the twenty-first and most recent ecumenical council of the Catholic Church. It met in St. Peter's Basilica in Vatican City from 11 October 1962 to 8 December 1965, during the pontificates of Pope John XXIII and Pope Paul VI.