VPN is used by the companies who have very sensitive data flow in their organization.

Data is crucial in terms of every aspect for some governing bodies like military.

So in that case these bodies purchase their own private network that will take some resources from existing networks

.

But it doesn't mean that security is compromised anyhow best security mechanism is provided.

It supports three types of connectivity:

• Remote client connections
• LAN-to-LAN internetworking
• Controlled access within an intranet

Virtual Private Network provides the dedicated connection to the provider by using some used resources which are not especially meant for it

It creates a kind of tunnel over which data can be float over it , so better privacy and security is achieved as compared to the legacy networks.

You need to pay high price for getting services of VPN.

But there is little threat from the resources that is not dedicated for VPN but is used for providing VPN service if this thing is controlled you could achieve the best security in the flow of data.

So VPN is a tunnel that uses the existing network resources for getting data but the point may differ when data gets floated from this point to the private tunnel.