The total set of interlinked hypertext documents worldwide is
The total set of interlinked hypertext documents worldwide is HTTP.
HTTP means HyperText Transfer Protocol. HTTP is the underlying protocol used by the World Wide Web and this protocol defines how messages are formatted and transmitted, and what actions Web servers and browsers should take in response to various commands.
The World Wide Web is named a 'Web' because hypertext documents (webpages) are connected together - in a system likened to a 'Web' - through the use of hyperlinks. Hyperlinks are text/images that are embedded into hypertext documents (webpages), and include a URL.