We've never had a great page on CodePen to send someone to that entirely explains what CodePen is. That's kind of a shame, especially since CodePen is a bit complicated to explain. So we put one together.
It's a "marketing" page I suppose, since we would likely link people to here from an ad. Better land there than the homepage which would be confusing for a first-time visitor. The homepage is for our lovely returning visitors, focusing on showcasing the community.