what is the use Snippets tab in Chrome Browser

All i want to know is what is use of snippet while debugging in chrome…..i saw some examples on google,but i didn’t able understood and that are not fullfil my expectations.

when i tried in google for a hour,i seen too much of blogs but all the examples are same, no one tell the actual use or where were we can use the snippet

So, guys please tell me the actual use of snippets with examples,please find a image below for your reference

Thanks in advance

Snippet image