An extranet is a private network that allows controlled access to specific external users, such as business partners, suppliers, or customers. It extends an organization's internal network, enabling secure communication and collaboration while maintaining privacy. This setup is often used for sharing information, documents, and resources without exposing the entire internal system. Extranets typically use internet protocols and security measures, such as firewalls and encryption, to protect sensitive data. They can facilitate various functions, including project management, customer support, and supply chain management, enhancing efficiency and fostering better relationships with external stakeholders.