I just found an answer to this yesterday:<p>"An internet (lowercase “i”) is any collection of separate physical networks, interconnected by a common protocol, to form a single logical network. The Internet (uppercase “I”) is the worldwide collection of interconnected networks, which grew out of the original ARPANET, that uses Internet Protocol (IP) to link the various physical networks into a single logical network. In this book, both “internet” and “Internet” refer to networks that are interconnected by TCP/IP."<p><a href="http://www.morninj.com/2012/03/internet-or-internet/" rel="nofollow">http://www.morninj.com/2012/03/internet-or-internet/</a>