Although some people use the terms "Internet" and "Web" interchangeably, they are not the same. There are several parts of the Internet which aren't considered part of the Web. They are generally less commercialized and easier to access on older computers or low-speed connections:

FTP... The File Transfer Protocol is often used for downloads from web sites and maintaining files on the sites. Some FTP sites can be accessed anonymously and navigated independently from the Web. Most browsers have FTP capability, but stand-alone applications called FTP clients are also available.

Usenet... Newsgroups are a text-based equivalent to the message boards of the Web. They're generally free of advertising. Users access them with newsreader applications and can subscribe to groups of interest, among many choices. Usenet groups aren't quite as popular as they once were, but some remain active.

Gopher... A largely abandoned alternative to the Web that offers a plain but fairly sophisticated means of accessing information and other content. Some, but not all, web browsers have included support for the Gopher protocol. Read the "Gopher Manifesto" from 2002 for more details and a brief history.

POP3 email... If you don't use a web-based service (like Hotmail or Gmail), your email is also a different part of the Internet. POP3 is accessed using an email client application. Messages can be text-based or have HTML code in them. Another non-web protocol for using an email account is IMAP.

Each of these segments of the Internet may be accessed with a regular Internet Service Provider (ISP); they should not be confused with things like BBSes (Bulletin Board Systems) that require dialing into an entirely separate computer system.

The Alternative Electronic Information Network is another part of the Internet outside of the Web. It offers a fast, efficient, ad-free system complete with graphics and photos. News, weather, statistics, product reviews, recipes, ebooks, world time, and much more can be found on the AEIN.
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