Occasionally I see people mention gluetun.

• What’s gluetun? Seems like it’s a VPN client? What’s special about it?
• How do you use it in your setup?
• Do I need to know about this if I use Tailscale on the host for connecting to my VPN?
• Would gluetun allow me to use an additional VPN provider for certain apps without messing with the host Tailscale?