The word catechetical comes from a Greek word meaning echo.   All who hand on the Faith echo the Word of God, Jesus Christ, as proclaimed in Scripture and in the teachings of the Catholic Church, following Jesus command, “Go and make disciples of all nations, baptizing them in the name of the Father, and of the Son, and of the Holy Spirit, teaching them to observe all that I have commanded you.” 
(Matthew 28: 19-20)