9Marks is a Christian organization focused on promoting healthy church practices. Founded in 1998 by Mark Dever, it emphasizes the importance of church membership, leadership, and discipline. The organization provides resources, including books and articles, to help churches align with biblical principles. The name "9Marks" refers to nine essential characteristics that the organization believes define a healthy church. These marks include expositional preaching, biblical theology, and congregational membership. By advocating for these principles, 9Marks aims to strengthen local churches and encourage spiritual growth among their members.