Final answer:
An extranet uses Internet technology to link businesses with their customers and partners, facilitating secure collaboration and data sharing.
Step-by-step explanation:
An extranet is indeed a collaborative network that leverages Internet technology to connect businesses with their external partners, which may include suppliers, customers, or other businesses that are part of their supply chain. This technology allows for secure communications and sharing of data, applications, and systems and is designed to facilitate inter-organizational collaboration.
Contrary to the restrictions of the ARPANET during its initial phase, where commercial and political communications were not allowed, modern extranets are integral to business operations and enhance productivity by enabling closer cooperation and sharing of information.