Port open in router - connecting through that port with VPN defeats purpose of VPN?

VPN
1

So let me just start by saying im a total n00b when it comes to networking so if my question or assumptions are dumb, you know why and i am sorry.

So lets say I have a port open in the router, i can see it open with “ismyportopen” services, alright.
Now lets say I have a VPN active and a torrent client and connect though said port in the router to download a linux distro with that torrent client.

Will that defeat the purpose of using a VPN in the first place and make me visible to say, my ISP ?
Or does a VPN override the router all together either way and that open port does not even matter?

Just trying to learn.
Thanks.

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2

There are mesh type VPNs, which don’t require opening ports. But let’s suppose we’re talking about a more traditional VPN server like OpenVPN or Wireguard. Those require a single UDP port with UDP being a stateless protocol, which doesn’t respond to basic port probes. Remember, an open port itself isn’t a security risk. There needs to be some kind of insecure listening service behind that port to create a vulnerability. The idea with a good VPN is that it is a secure service due to the use of strong cryptography.