A computer on the network is identified by what is known as an IP address, which consists of four numbers separated by dots, such as 127.0.0.1. However, there is one address that cannot be used by any computer in the world, and that address is 127.0.0.1. The reason is that this address has been reserved as what is known as the loopback address. A loopback address is an address that tells the computer not to test its connections to another computer, but to test its own basic network setup. When we use "ping 127.0.0.1" command that tests whether the TCP/IP protocol stack of the machine is working properly.
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