The term "Latter-day Saint" refers to members of The Church of Jesus Christ of Latter-day Saints, a Christian denomination founded in the early 19th century by Joseph Smith. The church believes in the restoration of the original church established by Jesus Christ and follows the teachings found in the Book of Mormon, which they consider another testament of Jesus Christ alongside the Bible. Latter-day Saints emphasize the importance of family, community service, and personal revelation. They practice unique beliefs such as the concept of eternal families and the importance of modern-day prophets. The church is known for its missionary work and humanitarian efforts worldwide.