internet是一个通用名词，泛指互连的多个网络。而Internet是一个专用名词，特指当前全球最大的、开放的、由众多网络通过TCP/IP协议族相互连接而成的网络，它的前身是ARPANET。
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To avoid confusion, please note that the word "
internet" will always be used in this book in a generic sense. In contrast, the
Internet(note
uppercase I) means a specific worldwide internet that is widely used to
connect universities, government offices, companies, and of late,
private individuals.
TANENBAUM, Andrew S.,
Computer Networks, 3ed, Prentice Hall
The lowercase
internet means multiple networks connected together, using a common protocol suite. The uppercase
Internet
refers to the collection of hosts (over one million) around the world
that can communicate with each other using TCP/IP. While the Internet
is an internet, the reverse is not true.
STEVENS, W. Richard,
TCP/IP Illustrated, Volume 1: The Protocols, Addison-Wesley
"A key idea in the ARPA research was a new approach to interconnecting LANs and WANs that became known as an
internetwork. The term is usually abbreviated
internet."
"To distinguish their internet from other internets, researchers working on the ARPA project adopted the convention of writing
internet in lower case when referring to internetworks in general, and writing
Internet with an uppercase I when referring to their experimental prototype."
COMER, Douglas E.,
The Internet Book, 3ed, Prentice Hall
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