A virtual private network (VPN) is a technology to connect computer systems with remote computer networks by using the Internet or another intermediate network. In other words, A VPN is a private network that uses a public network to connect remote sites or users together. The VPN uses "virtual" connections routed through the Internet from the business's private network to the remote site or employee.
VPNs can connect individual users to a remote network or connect multiple networks together. For example, users may use a VPN to access their office system from home.