A Gardeners Forum Forums General Discussion New Members Returning Members... What is.......?

I feel a bit silly asking this.....but what is the "Portal Page". :duhh:
I've gone back to it quite often now and I'm still not sure what it is or where it comes from. I'm still wondering around trying to figure it all out. :thum:

To me, it looks like a sample page of the type of posts you find in the forums.