Wikipedia is set to celebrate its 25th anniversary on January 15, 2026, marking a significant milestone for the collaborative online encyclopedia. Launched in 2001 as a revolutionary free resource, it evolved from a side project to Nupedia, embracing open editing. Today, Wikipedia exists in over 300 languages with more than 60 million articles. Co-founder Jimmy Wales' new book, 'The Seven Rules of Trust,' explores maintaining trust in an era of declining public confidence, drawing lessons from Wikipedia's success.