What is the purpose of a newline \n in PHP?

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PHP

Is this used as a comment or something or does it create a space between characters which I notice that's what it does. I know it dose not create a line break so why is

there so little info about this? There is so much info on how rather than what this means \n actually. For example

INPUT

<?php
echo "a\nbc";
echo "abc";
?>

OUTPUT
a bcabc

The only thing I notice is it gives me a space that's all I notice is that what it is good for? Couldn't I just add a space with the space bar and do the same thing why is

this helpful? Please don't just quote from jargon terms. Explain in your own words the most easiest way possible what this does and why would any one use this since it doesn't do any thing magical in output thank you.

What I have tried:

Having a hard time to find info about this on google. Every one is more interested on google on how to use this rather then what this does.