Missionaries of the Church of Jesus Christ of Latter-day Saints (LDS Church)—widely known as Mormon missionaries—are volunteer representatives of the church who engage variously in proselytizing, church service, humanitarian aid, and community service. Missionaries of the LDS Church may be male or female (Sister Missionaries) and may serve on a full- or part-time basis, depending on the assignment. Missionaries are organized geographically into missions, which could be any one of the 411 missions organized worldwide.