What is the Reward and activity thread use for?

I know how to use poll thread.

But I don't know reward & activity thread.

Me also dont know that thread.

If this two thread useless for me then how I disable them ??

And...Did Ann know How to use it?

Reward thread means that you can post a question thread and if someone ask rite, you can give the credits to him.

Activity thread means if you want to have some activitise as mountain climbing, or have a trip something like that, then you can post an activity thread.

of course  you can disable those function:

Forums - Edit Forum - [edit] - Allow Post Speical Thread: choose you want.

what is trade thread then?