web application – 127.0.0.1 accessing the internet

Imagine you are passing grades in elementary school. You send the following message:

From my part
To: Jeff
Message: I want to fight with you for the flagpole after school

You pass this message to the person next to you and they transmit it … and the message finally reaches Jeff. Jeff is now very confused, because he's pretty sure he just sent a message about fighting with the flagpole after school … but he does not remember sending it … and if he tries to answer, he'll get even more confused and , finally, just drop the note on the ground and forget that it ever happens.

To a computer 127.0.0.1 Is essential I Specifically used for a computer that talks to itself (for example, communication between processes)