Using GNS3, you can add your PC to your network designs instead of virtual machines. You can select existing network adapters or add a Loopback network adapter. So, a GNS3 Loopback Adapter allows you to communicate with other PCs or virtual systems on the same network.
You can make more detailed network plans when you add a Loopback adapter to your GNS3 program. Also, combining your computer with virtual systems helps you create more advanced projects.