Calvinists are followers of the theological teachings of John Calvin, a 16th-century Protestant reformer. They emphasize the sovereignty of God, the authority of Scripture, and the necessity of grace through faith for salvation. Calvinism is known for its belief in predestination, which suggests that God has already chosen who will be saved and who will not. Calvinism has significantly influenced various Christian denominations, particularly the Reformed and Presbyterian traditions. Its principles have shaped discussions on morality, governance, and the role of the church in society, making it a key component of Protestant thought.