Catechesis (pronounced "cat-uh-kee-sus") is a big word that means education, specifically education in the Christian Faith.
To Catechize is to teach others about the Christian Faith. And the Catechism of the Catholic Church is so named because it is a summary of teachings of the faith.
Here is what the Catechism has to say about Catechesis:
Quite early on, the name catechesis was given to the totality of the Church's efforts to make disciples, to help men believe that Jesus is the Son of God so that believing they might have life in his name, and to educate and instruct them in this life, thus building up the body of Christ.
"Catechesis is an education in the faith of children, young people and adults which includes especially the teaching of Christian doctrine imparted, generally speaking, in an organic and systematic way, with a view to initiating the hearers into the fullness of Christian life."
While not being formally identified with them, catechesis is built on a certain number of elements of the Church's pastoral mission which have a catechetical aspect, that prepare for catechesis, or spring from it. They are: the initial proclamation of the Gospel or missionary preaching to arouse faith; examination of the reasons for belief; experience of Christian living; celebration of the sacraments; integration into the ecclesial community; and apostolic and missionary witness.
"Catechesis is intimately bound up with the whole of the Church's life. Not only her geographical extension and numerical increase, but even more her inner growth and correspondence with God's plan depend essentially on catechesis."
Periods of renewal in the Church are also intense moments of catechesis. In the great era of the Fathers of the Church, saintly bishops devoted an important part of their ministry to catechesis. St. Cyril of Jerusalem and St. John Chrysostom, St. Ambrose and St. Augustine, and many other Fathers wrote catechetical works that remain models for us.
(CCC 4-8)
Keep Pursuing