Final answer:
A VPN allows secure transmission of data over an unsecured public network link between private networks.
Step-by-step explanation:
The answer to your question is VPN, which stands for Virtual Private Network. A VPN allows secure transmission of data over an unsecured public network link between private networks. It creates a private tunnel through which data is encrypted and transmitted, ensuring confidentiality and security.
By using a VPN, organizations can establish a secure connection between their private networks over the internet. This is particularly useful when accessing sensitive information or conducting transactions over public Wi-Fi networks, where data can be intercepted by malicious actors.
SSL/TLS (Secure Sockets Layer/Transport Layer Security) is also a secure protocol, but it primarily focuses on securing individual connections between a client and a server. FTP (File Transfer Protocol) and HTTP (Hypertext Transfer Protocol) are not specifically designed for secure transmissions, making them less suitable for protecting data over unsecured public network links.