The Orthodox Presbyterian Church (OPC) is a conservative Protestant denomination founded in 1936 in the United States. It emerged from a desire to maintain traditional Reformed beliefs and practices, emphasizing the authority of Scripture and the importance of the Westminster Confession of Faith as a guiding document. The OPC is known for its commitment to the doctrines of grace and its focus on church planting and evangelism. It operates under a presbyterian form of governance, meaning that local churches are governed by elected elders and are part of a larger assembly of churches, promoting unity and cooperation among congregations.