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A VPN, or Virtual Private Network, is a widely used technology in the field of computer networking. It allows a secure connection to be created over a public network like the internet. This secure tunnel encrypts the data being transferred, making it unreadable to unauthorized users.

The term Virtual refers to the fact that the connection is established through software rather than a direct physical link. Private means that the connection is encrypted and restricted to authorized users, which ensures data privacy. Network refers to the group of connected computers or devices using this secure pathway to communicate.

VPNs are commonly used by businesses to give employees secure access to internal systems from remote locations. Individuals also use VPNs to protect their personal data when using public Wi-Fi, access region-restricted websites, or maintain anonymity online.

Incorrect options such as Verified Protocol Network, Virtual Protected Node, and Variable Packet Network are not recognized terms in computer networking. The only correct and standard definition of VPN is Virtual Private Network, and it's a foundational concept in both IT security and modern communication systems.