What are keys used for in Flutter framework? : <p>Flutter is an amazing framework straightforward and easy to use. I must see that the documentation is very good but there are some concept that are still vague to me, for instance the <code>key</code> parameter. According to the documentation <code>A Key is an identifier for Widgets, Elements and SemanticsNodes.</code> It's clear, but why do I need to identify my widgets. So far I never used keys in my coding. Is there any benefits of using keys in my code? Thanks.</p>
