The word Mormon originally derived from the Book of Mormon, a religious text published by Smith, which he said he translated from golden plates with divine assistance. The book describes itself as a chronicle of early indigenous peoples of the Americas and their dealings with God. Based on the book’s name, Smith’s early followers were more widely known as Mormons, and their faith Mormonism. The term was initially considered pejorative, but Mormons no longer consider it so (although generally preferring other terms such as Latter-day Saint or LDS).
After Smith was killed in 1844, most Mormons followed Brigham Young on his westward journey to the area that became the Utah Territory, calling themselves The Church of Jesus Christ of Latter-day Saints (LDS Church).