A lay leader is a member of the laity in any congregation who has been chosen as a leader either by their peers or the leadership of the congregation. In most denominations, lay leadership is not an ordained clerical office, and the lay leader's responsibilities vary according to the particular tradition of the congregation. Some organizations do not allow the lay leader to give sacraments for example, but do allow them to perform most other portions of the service that are normally the responsibility of the clergy (e.g. giving sermons when the regular clergy are on vacation).