I came across this rather lovely 8 minute film that explains how the Internet came into being. Its production values are reminiscent of a 1970s Open University TV show, which appealed to me as I'm about to begin an MA in Online and Distance Education with the OU; although the learning environment is rather more dynamic now than the shows I caught on TV as a youngster.
Anyway, this gives a great background to the system that allows us now to communicate visual, auditory and text based data with the minimum of fuss. It's worth watching to the end. Enjoy.