What are collections?

Sometimes I see references to collection in peoples posts. Is it a way to sort posts, like groups or forums? And while I’m here, are groups and forums the same thing?

I’m not here very often so all this confusing.

Even posting this question is confusing- I have choose from a list and none of the are relevant? The help section is useless

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FeetAreFantastic · 41-45, M

Collections are indeed a way to categorize your own posts. You can make whatever categories you want. I made one myself for posts around a certain theme so that I can easily find them back.
It is supposed to make it easier for others' too, but I don't think many people look there. It's more for yourself.

And yes, groups and forums are the same now.