Wikipedia, the world’s largest free online encyclopedia, marks its 25th anniversary, having fundamentally reshaped access to knowledge. Since its launch in 2001, Wikipedia has grown into a multilingual platform with over 60 million articles, collaboratively maintained by millions of volunteers worldwide. It has become an indispensable reference for education, journalism, and research, while influencing digital literacy and open-access movements. As the platform celebrates this milestone, it faces challenges such as content accuracy, editorial bias, and monetization sustainability.