On Windows, you will see a "temporary IPv6 address" and "IPv6 address" on your network configuration screen. On Linux, you will see an IPv6 address without a temporary tag, and an IPv6 address with one, when you run the command `ip address`:
inet6 2406:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:62c9/64 scope global temporary dynamic
inet6 2406:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:a31c/64 scope global dynamic mngtmpaddr noprefixroute
Temporary IPv6 address changes every now and then, but your stable IPv6 address will never change unless your ISP changes your prefix, you change your network, or your network card entirely.
When you are browsing the internet, the OS will use the temporary address for outgoing connections (unless the application forces stable addressing). But when you are hosting a service, you give your users (in this case, your laptop) the stable address.
When you are browsing the internet, the OS will use the temporary address for outgoing connections (unless the application forces stable addressing). But when you are hosting a service, you give your users (in this case, your laptop) the stable address.