I don't get this 'Post' genre thingy?

I just don't get the whole 'post' thing in general. Like, post grunge, post metal, post hardcore, post punk.

To me, post punk just sounds like a more 'poppier', less aggressive version of Punk. I know this is probably wrong. So...

What you all think?
Update: There are many famous post rock bands like, Sigur Rós & Pelican.
Update 2: Post rock is an experimental type of rock. A defining characteristic of this sub genre is that the guitars are used mostly for timbre & texture instead of power chords & riffs. It's focused more on ambiance than the traditional guitar driven sound of trad rock.

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