Pope Pious IX approved Vatican 1. The very first ecumenical council of Catholic Church was dashed short by war. As a result of this, it was continued in Vatican 2 which came 100 years later. Christian believers around the world agree to the teachings in their religion and are expected to follow the disciplinary rules the church has set during that particular time. Vatican 1 is popular for the principle of Papal infallibility and due to this, you cannot challenge the doctrines of Vatican 2 as well. They produced a lot of documents that were drawn from ancient doctrines of the church, which is the keeper of the faith.
Pope Paul VI approved this council. Vatican 2 produced a number of documents that were actually restated documents from older doctrines of the church which is the trustee of the faith. This council was much longer and produced several documents apparently as the Christian population was increasing by the time it was held in 1963-65. Nevertheless, the council gave disciplinary rules for the administration of the Church in the near future.