Virtual private networks are extremely useful when needing to
connect two or more networks together that are not at or near
the same location. An example of when a VPN would be used is if
you have two networks across town from each other, and wanted to
share files, connect to a database, or print from one network to
another, a VPN would be the solution to your situation. VPNs are
also very secure so no one would be able to see
information going back and forth.
There is no distance limit to a VPN, it can be across the state
to across the world. They can also be used if a single person
must log in and use the network resources.