Typically, it is a lay minister trained in the art of catechesis. It might also be a pastor or priest, religious teacher, or other individuals in church roles (including a deacon, religious brother or sister, or nun). The primary catechists for children are their parents[.
A catechist is a person who teaches the principles of a religion, typically within a formalized setting such as a church or religious education program. Catechists help individuals understand and deepen their knowledge of their faith through instruction and guidance.