"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.
  protocol://user:password@machine:port/url-path