"Sola fide" is a Latin term meaning "by faith alone." It is a key doctrine in many branches of Christianity, particularly in Protestantism. This belief emphasizes 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 emerged during the Reformation in the 16th century, primarily advocated by figures like Martin Luther. It challenged the prevailing views of the time, which often linked salvation to a combination of faith and works. "Sola fide" underscores the importance of personal faith in the relationship between believers and God.