The term often relates to the transition from childhood to adulthood, and may involve secret or private procedures and/or painful and difficult trials before the initiate can become a "real" or "accepted" man or woman who the community is bonded to; and who is bonded to the community.
Hunter-gatherer societies have a reputation for dramatic pre-requisites before an initiate can become a full adult, marriageable member of society.
Some Christian churches offer a traditional sacrament of confirmation as an initiation rite recognizing full membership in itself and a re-capping of infant baptism; others are more strict.
In Judaism, a Bar mitzvah or a Bat mitzvah ceremony performs a similar religious coming-of-age function.
Many school systems feature a graduation ceremony as an initiation rite marking the end of a stage of learning.