From what I can tell, you're asking about a VPN service to use from wherever your computer is located to reroute through another to reach the internet. This can hide your IP and location and add a level of security.
In addition and most precisely a VPN connection can be made from a computer on the internet to a LAN in another location. I have a VPN setup a home which I can connect through to get a secure tunnel and local IP on my home LAN. Many services are setup to provide certain accessibility to addresses on the same LAN but not outside to the internet.
For example, if I want to use the remote desktop function from my laptop while out of town to a pc at home, I need to setup port forwarding on my router from the outside to the correct IP. Or I can connect via my VPN and not have to bother changing my router config.
Some companies I've worked for have VPNs configured for folks like me that regularly work remotely. This allows connections to the company intranet and network shares.
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