Can you help me understand what a VPN is?
user
Sure, I think I can help you understand how a VPN works.  Do you mind if we talk for a bit to understand how this works and why people use them?
assistant
Can you help me understand what a VPN is?
user
Yes, I can.  In essence, a VPN allows a person to connect to a secure “tunnel” (a series of servers) that tunnels over the Internet.  When data passes through a VPN, it travels in what’s called “tunnel mode”.  Other computers on the Internet can’t see where your data is going.  But while you’re using a VPN, your data travels over the Internet normally, and your Internet service provider (ISP) sees that you’re using the Internet normally, so you won’t be charged extra.
assistant
Can you help me understand what a VPN is?