"Sola Fide," a Latin term meaning "by faith alone," is a key principle of the Protestant Reformation. It asserts that faith in Jesus Christ is the only means by which individuals can attain salvation, rather than through good works or religious rituals. This doctrine emphasizes the importance of personal belief and trust in God's grace. The concept of Sola Fide was championed by reformers like Martin Luther and John Calvin, who argued that salvation is a gift from God, accessible to all who believe. This idea challenged the teachings of the Catholic Church, which emphasized the necessity of faith combined with works for salvation.