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A virtual private network (VPN) is a private network that is created over a public network (such as the Internet). It is used to securely connect devices and allow them to communicate as if they were on the same private network.

A VPN uses encryption to protect the transmitted data and to secure the connection between the devices. It can be used to protect communication between devices that are connected to the Internet, such as when accessing the Internet from a public WiFi network or when connecting to a remote server over the Internet.

There are several different types of VPNs, including remote access VPNs, site-to-site VPNs, and mobile VPNs. Remote access VPNs are used to allow individuals to securely connect to a remote network over the Internet, such as when working remotely. Site-to-site VPNs are used to connect two or more private networks over the Internet, such as when connecting the networks of two different offices. Mobile VPNs are used to secure communication over a public network when using a mobile device, such as a smartphone or tablet.

A VPN is useful for protecting the privacy and security of communication over the Internet. It can be used to encrypt transmitted data, to hide the IP address of the devices, and to prevent unauthorized access to the private network.