The World Wide Web (WWW) is a fast growing and popular service on the Internet. It is an attempt to organize all the information on the Internet by linking many sites to each other.
You can think of the WWW as a worldwide library on the Internet. The books in this library are Web "sites", and the individual book pages are the Web "pages". Each website has a starting point, similar to a table of contents in a book, which is called a "home page." All these components are linked with each other and thus form a "WEB" of information.

You can easily detect whether a text or graphic is a link by moving the cursor over it. If the information is linked, the cursor will change to a hand with a pointing finger.

Here are some examples:
 

II. EXPLORING GOPHER

Gopher is a tool that allows you to access Internet resources by clicking on links in hierarchical menus of resources. Veronica, a system that is built into gopher, allows you to search most gopher sites for menu items (files, directories, and other resources) using keywords. However, this is not a full-text search of the contents of documents. The result of a search is an automatically generated gopher menu, customized according to the user's keyword specifications. Today, more and more gopher sites are being changed to websites.

For example: gopher://gopher.un.org:70/11/ga/recs links  to a listing of United Nations General Assembly resolutions from 1997 to 1981.
 

III. FINDING AND RETRIEVING FILES USING FILE TRANSFER PROTOCOL (FTP)

FTP is a standard protocol that governs the transmission of data from one computer to another. It allows you to log on to a remote computer on the Internet and retrieve single or multiple files from that computer and download them to your own workstation. In addition, FTP provides the tools needed to identify the current directory on the remote host, list the files in this directory, change to other directories, and rename or delete files. Using FTP, you can remotely access files on a host for which you have a valid account and password, or you can use anonymous FTP to access files in public directories. To use an FTP access tool you need to know the computer address of the site to which you want to have access.
 

IV. USING TELNET

Telnet allows you to log on to a remote computer and read the directory of files located on that remote computer and use its programmes. Thus, using Telnet, you can log on to a computer and have much the same access to it as if you were actually sitting at its own keyboard console. Many computers on the Internet are protected by passwords and only authorized users can have access to these protected files. Other computers that allow a Telnet connection will permit access by asking you to use the word anonymous or guest as a login. To use Telnet, you need to know the Internet address of the computer to which you want to establish a connection. 

For example: Through connecting to telnet://opale02.bnf.fr you can search the catalog of the National Library of France.