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Telnet and FTP (generic roles which several pieces of software may fill) create an interface between your desktop computer (which is easy to access and use) and the big computers at your service provider (which actually make your web documents available to the world).
Telnet creates an interface between the User Interfaces of the two systems. That is, it allows you to work on your computer as though you were sitting in front of the server.
FTP creates an interface between the file systems of the two computers. That is, it allows you to perform the usual file operations on both systems (rename, copy, delete,etc.), and also performs the crucial task of moving files between the systems. This allows you to create Web Documents on your desktop computer, then move them to the server where the rest of the WWWeb can "see" them.
