Q)Why 127.0.0.1 is known as localhost and why it is common for every system? -> This address is also known as the Loopback address, which means any request sent to this address is again sent back to the same machine. -> Here internal communication will be happening, so that no internet is required. -> We can test our application so safely without connecting to the internet, which helps us to create a controlled environment for the application to interact without affecting the outside world. A possible question may arise? Q) But every device will have a unique IP address know? Then how 127.0.0.1 is a localhost to every system? ->The range of IP addresses from 127.0.0.0 to 127.255.255.255 are specially reserved for loopback addresses by the Central Internet Authority (IANA - Internet Assigned Numbers Authority) -> When we use the external communication(i.e., connecting to the internet to access the resources over the network), we require a unique IP address for accessin