The Magisterium of the Catholic Church has been much misunderstood by Catholics and non-Catholics alike both throughout history and in present times. Addressing the nature of the Magisterium as defined by Vatican Councils I and II, the Constitution on the Faith, and the Catechism of the Catholic Church, this book provides a factual and easy-to-understand outline of the basic principles of the Magisterium, what it is and what it is not, and its relationship to Christian believers. It also gives an in-depth look at what constitutes the ordinary magisterium of the Pope, as well as the intrinsic nature of papal indefectibility and infallibility.