What does it mean
To catechize means to teach: more specifically, to teach by word of mouth. Prior to Vatican II the main Catechists at a Parish level were priests, religious brothers or nuns. However, increasingly the role of the Parish Catechist has been undertaken by Catholic Laity.
more about catechists
In addition to the parish, catechizing also takes place in the Catholic schools through more formal classes as part of their curriculum.
Catechists are often deployed to teach Candidates who are preparing for the Sacraments of Reconciliation, First Holy Communion, Confirmation and the Rite of Christian Initiation of Adults (RCIA). Various age appropriate religious education texts and materials used for instruction as well as the Catechism of the Catholic Church.