"The World Wide Web"
An amorphous network of unrelated computers.
They share the ability to provide "services" (in the form of
documents, images, binaries) to Web clients on request.
They share a common set of data transfer protocols.
HTML - HyperText Markup Language.
HTTP - HyperText Transfer Protocol.
They share a common naming convention for the "services" provided.
URLs - Uniform Resource Locators.