The loopback adapter or interface is a special interface, which is used by system itself to communicate with own network services. This interface is completely virtual. Generally for troubleshooting or diagnostics, it is being used.
Let’s discuss about something, how it is useful to us or how it is working. Suppose, our server’s network adapter gets disconnected from its connected network. In this situation, there is no way available for our server to reach its own services. Because, one server's must have to be gone through the network adapter to connect its own network services.
To resolve this issue, we have to create one virtual adapter that is being called loopback adapter. The advantages of using this loopback adpater is, if our network adapter goes down or gets disconnected, still server can access its own resources by using its loopback adapter. One more benefit is, there is no chance to get down or disconnected with this loopback adapter. Because it is virtual, not a physical interface.
Let's discuss about one more thing. Suppose you are a web developer. You have built a web server on your local computer. We assume that, your local computer is not connected to any network or this system has no network adapter attached. What you will do now? How you are going to test your server? To test your web server, you must have gone through the network service. The loopback adapter can help us in this case too. No need to be had connected network or network adapter. Just create one loopback adapter. Everything is done. You are ready to go.
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