Real beginner traits question

[WhatMeForget]

This is taken exactly from the traits documentation.

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25 Traits

25.21 identifier

Takes one argument, a symbol. Returns the identifier for that 
symbol as a string literal.

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There are no examples. My naive brain keeps thinking that a 
symbol and an identifier are the same things.  Can someone give 
me good definitions of "symbol" and "identifier".   And maybe an 
example if it is not too much trouble.