SSH Port Forwarding

You open a tty on another computer to a server. You forward a port from that server to be visible on this computer.

Opening web UIs

Very niche case, but think about this: You spawned a TTY of your server. You dont have any browser on the server. Yet, you install a software that requires a web UI.

Example with Syncthing

https://superuser.com/questions/1397683/how-can-i-configure-syncthing-from-command-line-to-share-a-folder-with-another-c

ssh -L 8080:localhost:8384 your.host.name

Then you can access the remote web GUI from http://localhost:8080