§1. Catechists are to be used in carrying out missionary work; catechists are lay members of the Christian faithful, duly instructed and outstanding in Christian life, who devote themselves to setting forth the teaching of the gospel and to organizing liturgies and works of charity under the direction of a missionary.
§2. Catechists are to be formed in schools designated for this purpose or, where such schools are lacking, under the direction of missionaries.
Source: Code of Canon Law (Vatican.va)