Sola Fide, meaning 'faith alone' in Latin, is a fundamental doctrine of the Protestant Reformation asserting that faith in Jesus Christ is the only means by which individuals can attain salvation. This principle was pivotal in Martin Luther's teachings, emphasizing that good works or adherence to church rituals are insufficient for salvation, thus challenging the established Catholic Church's teachings. Sola Fide represented a shift toward personal faith and the belief that salvation is a gift from God, accessible to all believers.