Keil and Cortex-M AREA ALIGN=x directive


I'm a little bit confued.

How does "AREA ALIGN=2" directive work?

I mean ALIGN=x of course.

I am trying to undersand how it works and what it  is for?

Can you explain me in a very simply way? please 

W read a lot about 2 exp x boundry but what does it mean in phisical way?

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