如果你不熟悉它，你可能会认为Usenet是一个完全不同于Internet的“网络”，但是它们是两个完全独立的实体还是相互连接的？今天的超级用户问答帖子给出了这个问题的答案。

今天的问答环节是由SuperUser提供的，SuperUser是Stack Exchange的一个分支，是一个由社区驱动的问答网站分组。

上面显示的截图由维基共享资源提供。

问题

超级用户读者帮助我想知道Usenet和互联网的区别：

I am quite confused about what exactly Usenet is. On the Wiki article page, it says that Usenet is a “worldwide Internet distributed discussion system”.

First off, if it is “an Internet”, does that mean it’s just a global network of computers, but it’s not like, say, the World Wide Web with hypertext documents? I would like to know what draws the line between the correctness of just saying “the Internet” as opposed to, say, Usenet.

Basically, Usenet is a global network, but doesn’t use the WWW? What does it use then?

Usenet和Internet是两个完全独立的实体，还是它们紧密相连，是一个大整体的一部分？

答案

超级用户贡献者Hennes为我们提供了答案：

Usenet is a network of servers which spread messages (posts) in newsgroups. They connect to each other, and people connect to them, over the Internet using TCP/IP, and exchange messages using the NNTP protocol.

The World Wide Web is a series of standalone servers, which people also reach over the Internet using TCP/IP, and retrieve web pages using the HTTP protocol.

But do not confuse the Web with the Internet. Webpages are but a **all part of the Internet, and many other programs used to connect to each other long before the first webpages were ever served. (For that, see the history of WWW.) The one you might be most familiar with is email, which is usually sent via TCP/IP over the Internet using the SMTP protocol, but there are many more.

Also note that in the past, servers would exchange email and Usenet messages over phone lines using UUCP as the protocol – forming an informal UUCPNET – as Internet connecti*** were rare and expensive for a long time.

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