A virtual private network refers to the technology of establishing a dedicated network on a public network for encrypted communication. Specifically, a virtual private network (abbreviated as VPN) is a method of creating a secure and encrypted dedicated network connection through a public network (such as the Internet). It allows users to securely transfer data between different geographical locations, as if they were directly connected to the same private network. The VPN establishes an encrypted "tunnel" between the client and the server through encryption technology, ensuring the security and privacy of data during transmission. This technology is widely used in enterprise networks to achieve remote access, cross-regional communication, and secure data transmission.