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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DeWayfarer · 61-69, M

Lots of good answers on this.

Just going to add that some people like myself have many collections. Often you must click on the little seen "More collections" Link.

There simply is no easy way to have only certain collections shown all the time. It's always last collection created first on the collection list.

Must say that I am likely they reason for the collections at all, because I used my photo albums as collections for years. Which I still maintain because collections do not allow for comments.

The index for my photo album type collections is my first featured post.