Adventism is a Christian movement that originated in the 19th century, primarily associated with the Seventh-day Adventist Church. It emphasizes the imminent return of Jesus Christ, known as the "Advent," and encourages believers to live in a way that reflects their faith in this event. Adventists observe the Sabbath on Saturday, following the biblical commandment to rest on the seventh day of the week. The movement began with the teachings of figures like William Miller, who predicted Christ's return in the 1840s. Although his predictions did not come to pass, the movement evolved, leading to the establishment of the Seventh-day Adventist Church in 1863, which focuses on health, education, and community service.