A ministry, in Christianity, is an activity carried out by Christians to express or spread their faith. 2003's Encyclopedia of Christianity defines it as "carrying forth Christ's mission in the world", indicating that it is "conferred on each Christian in baptism." It is usually performed by members of a church to fulfill the church's mission. This is distinguished from the "office of ministry", to which specific individuals feel a certain vocation. It can signify this activity as a whole, or specific activities, or organizations within a church dedicated to specific activities. Some ministries are identified formally as such, and some are not; some ministry is directed towards members of the church, and some towards non-members. See also Apostolates.