Which global system connects computer networks worldwide using a standard protocol?

The correct answer, "Internet," refers to a vast global system that interconnects millions of private, public, academic, business, and government networks across the world. The Internet utilizes the standard Internet protocol suite (TCP/IP) to enable communication and data transfer between devices. It serves as the backbone for a wide range of services, including email, file sharing, and web browsing.

While other options may seem relevant, they have distinct meanings. For instance, MSN is a web portal and related collection of Internet services and software produced by Microsoft, and it does not represent a global system but rather a specific service. Google, primarily known as a search engine, operates as one of many services hosted on the Internet but is not the infrastructure itself. The World Wide Web is a system of interlinked hypertext documents accessed via the Internet, but it is just one of the services that runs on the broader Internet framework. Therefore, the Internet is the foundational structure that enables all of these services to operate.