Final answer:
The main difference between an intranet and the Internet is that an intranet is a private, restricted network designed for use within a single organization, while the Internet is a public, global network accessible to anyone.
Step-by-step explanation:
The main difference between an intranet and the Internet is the scope and level of access. An intranet is a private network, accessible only to the members or employees of a specific organization, designed to securely share company information and computing resources among employees. In contrast, the Internet is a global network of networks that is publicly accessible, providing a vast array of information and services to anyone with the connection to log on. While intranets are restricted and often include security measures to prevent outside access, the Internet is a much more open platform where information and resources are shared freely amongst its users.