The significance of using social proof in online marketing lies in its ability to influence consumer behavior and enhance trust. Social proof refers to the psychological phenomenon where individuals look to the actions and opinions of others to guide their own decisions. In digital marketing, utilizing testimonials, reviews, case studies, or influencer endorsements can build credibility and encourage potential customers to take action. By showcasing positive experiences from previous clients or users, businesses can instill confidence in their offerings, ultimately boosting conversions and driving sales.