The vast network of computers that connects millions of people all over the world is called.

LAN
Web
Hypertext
Internet

The correct answer is: D. Internet

The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite (TCP/IP) to serve billions of users worldwide. It is a network of networks that consists of millions of private, public, academic, business, and government networks, of local to global scope, that are linked by a broad array of electronic, wireless, and optical networking technologies. The Internet carries an extensive range of information resources and services, such as the inter-linked hypertext documents and applications of the World Wide Web (WWW), electronic mail, telephony, and file sharing.

A LAN (local area network) is a computer network that interconnects computers within a limited geographical area such as a home, school, office building, or small campus. A LAN can be used to share resources such as files, printers, and Internet access.

The Web (short for World Wide Web) is a system of interlinked hypertext documents accessed via the Internet. With a web browser, one can view web pages that may contain text, images, videos, and other multimedia and navigate between them using hyperlinks.

Hypertext is a way of organizing and presenting information on the World Wide Web. It uses hyperlinks to connect related pieces of information. When you click on a hyperlink, you are taken to another web page or part of a web page.