SDA stands for Seventh-day Adventist, a Christian denomination that emphasizes the observance of Saturday, the seventh day of the week, as the Sabbath. Founded in the mid-19th century in the United States, the church promotes a holistic approach to health, education, and community service. The SDA Church is known for its commitment to the health message, advocating for a vegetarian diet and healthy living. It operates numerous educational institutions and hospitals worldwide, reflecting its mission to promote physical, mental, and spiritual well-being among its members and the broader community.