This truly is amazing if you think about it. Two thousand years of history and teachings and you can get the official stance of the Catholic Church on any issue with the click of the button.
Introduction to the Catechism
Here is what the Catechism itself has to say about its contents:
This catechism aims at presenting an organic synthesis of the essential and fundamental contents of Catholic doctrine, as regards both faith and morals, in the light of the Second Vatican Council and the whole of the Church's Tradition. Its principal sources are the Sacred Scriptures, the Fathers of the Church, the liturgy, and the Church's Magisterium. It is intended to serve "as a point of reference for the catechisms or compendia that are composed in the various countries".
This work is intended primarily for those responsible for catechesis: first of all the bishops, as teachers of the faith and pastors of the Church. It is offered to them as an instrument in fulfilling their responsibility of teaching the People of God. Through the bishops, it is addressed to redactors of catechisms, to priests, and to catechists. It will also be useful reading for all other Christian faithful.
Structure of the Catechism
The Catechism is broken up into four main sections.
Part One: the Profession of Faith - Those who belong to Christ through faith and Baptism must confess their baptismal faith before men. First therefore the Catechism expounds revelation, by which God addresses and gives himself to man, and the faith by which man responds to God (Section One). the profession of faith summarizes the gifts that God gives man: as the Author of all that is good; as Redeemer; and as Sanctifier. It develops these in the three chapters on our baptismal faith in the one God: the almighty Father, the Creator; his Son Jesus Christ, our Lord and Saviour; and the Holy Spirit, the Sanctifier, in the Holy Church (Section Two). - (CCC 14)
Part Two: the Sacraments of Faith - The second part of the Catechism explains how God's salvation, accomplished once for all through Christ Jesus and the Holy Spirit, is made present in the sacred actions of the Church's liturgy (Section One), especially in the seven sacraments (Section Two). (CCC 15)
Part Three: the Life of Faith - The third part of the Catechism deals with the final end of man created in the image of God: beatitude, and the ways of reaching it - through right conduct freely chosen, with the help of God's law and grace (Section One), and through conduct that fulfills the twofold commandment of charity, specified in God's Ten Commandments (Section Two). (CCC 16)
Part Four: Prayer in the Life of Faith - The last part of the Catechism deals with the meaning and importance of prayer in the life of believers (Section One). It concludes with a brief commentary on the seven petitions of the Lord's Prayer (Section Two), for indeed we find in these the sum of all the good things which we must hope for, and which our heavenly Father wants to grant us. (CCC 17)
Purpose of the Catechism
The purpose of the Catechism is to teach the Truth with Charity.
The Catechism emphasizes the exposition of doctrine. It seeks to help deepen understanding of faith. In this way it is oriented towards the maturing of that faith, its putting down roots in personal life, and its shining forth in personal conduct. (CCC 23)
To conclude this Prologue, it is fitting to recall this pastoral principle stated by the Roman Catechism: The whole concern of doctrine and its teaching must be directed to the love that never ends. Whether something is proposed for belief, for hope or for action, the love of our Lord must always be made accessible, so that anyone can see that all the works of perfect Christian virtue spring from love and have no other objective than to arrive at love. (CCC 25)