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The acronym VPN stands for Virtual Private Network. This term refers to a technology that creates a secure and encrypted connection over a less secure network, such as the Internet. By using a VPN, users can send and receive data as if their devices were directly connected to a private network. This is especially beneficial for protecting sensitive information when using public Wi-Fi. The "private" aspect emphasizes the confidentiality and security provided by the encryption, which ensures that unauthorized parties cannot access the data being transmitted.

The other terms provided do not accurately describe the function or nature of a VPN. For instance, "Virtual Personal Network" implies a personal use, lacking the emphasis on security. "Variable Public Network" fails to capture the notion of encryption and security entirely, while "Virtual Protocol Network" does not reflect any established networking term or technology related to secure data transmission. Hence, the correct answer encapsulates the definition and purpose of VPN technology.