Glossary
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The Internet with a capital "I" refers to the vast collection of inter-connected networks that all use the TCP/IP protocols that evolved from the development of the ARPANET by the U.S. Dept. of Defense (DoD) during the late 1960s and early 1970s.
To truly be considered as part of the Internet a network needs to be connected to the Internet backbone of routers called Internet eXchange Points (IXPs) either directly or by a proxy through an Internet Service Provider or (ISP).
Most modern day networks, including home networks, have a router which which routes data between the private network also known as an intranet (internal network) and the public network (external network usually owned and operated by major telephone and cable companies) which is connected to a router at the ISP's swicthing facility.
Related Info:
http://cis.bbent.com/glossary/?acronym=ARPA