The numbers are simply staggering: Every day, more than 450,000 hours of new videos are posted to YouTube. From a tiny site used for posting clips of tktkt, YouTube has become a world-spanning force. Inside, read how the company was born and developed and then discover some of the ways that people, businesses, governments, and more are using this technology to entertain and change lives.

Founding the company -- Going viral -- Game-changing technology -- Into the future.