There are a few important ones to remember. In addition to referencing information located on the Internet, most WWW browsers can also access files located on your hard drive. If the nominated link points to a file stored on an anonymous FTP server, the URL must begin with this definition. Gopher is a service that enables the user to navigate through Internet information easily. Gopher will present the user with either a directory or a file.
Most Gophers allow users to search for information too.
A link that points to a Usenet newsgroup must be declared using this protocol. This is one of the most widely used internet services that organizes peoples' comments according to the topic. These topics are called newsgroups and have their own structure. A link that needs to open a telnet session must be declared with this protocol. Telnet allows one computer to act as a terminal on another computer.