The World Wide Web is a virtual world. We can't feel it or touch it, but it connects millions of people around the world - sharing information and communicating. We can shop, study, watch films, send emails, play games or talk with friends online. We love being online, but it can be dangerous too! Do you know who started the biggest websites on the Internet? What other ways are there to store information? How can you be safe online? This book will tell you.