Virtual private network, also known as virtual private network (English: Virtual Private Network, VPN for short), is a communication method commonly used in connecting private networks between large enterprises or groups. The information of the virtual private network transmits the network information of the intranet through a public network structure (for example: the Internet). It uses the encrypted tunneling protocol to achieve the private message security effects such as confidentiality, sender authentication, and message accuracy. This technology can use insecure networks (such as the Internet) to transmit reliable and secure messages. It should be noted that whether the message is encrypted or not can be controlled. Virtual private network messages that are not encrypted are still in danger of being stolen.
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