Robert Cailliau is a Belgian computer scientist best known for his contributions to the development of the World Wide Web. He collaborated with Tim Berners-Lee at the CERN laboratory in the early 1990s, helping to create the first web browser and web server software. Cailliau played a crucial role in promoting the web as a public resource. In addition to his technical work, Cailliau has been an advocate for open standards and the free exchange of information on the internet. He has contributed to various initiatives aimed at improving internet accessibility and education, emphasizing the importance of digital literacy in the modern world.