Mormonism is the theology and religious tradition of the Latter Day Saint movement of Restorationist Christianity started by Joseph Smith in Western New York in the 1820s and 1830s. As a label, Mormonism has been applied to various aspects of the Latter Day Saint movement, although there has been a recent push from the Church of Jesus Christ of Latter-day Saints to distance themselves from this label. A historian, Sydney E. Ahlstrom, wrote in 1982 that, depending on the context, the term Mormonism could refer to “a sect, a mystery cult, a new religion, a church, a people, a nation, or an American subculture; indeed, at different times and places it is all of these."

The First Vision refers to a theophany which Latter Day Saints believe Joseph Smith experienced in the early 1820s, in a wooded area in Manchester, New York, called the Sacred Grove. Smith described it as a vision in which he received instruction from God the Father and Jesus Christ.