Hi! I thought I recognized this thread
Yes, I am the culprit of the "hub page" suggestion.
I call a page a "hub page" if it functions like the center of a wheel with a bunch of spokes attached to it. Okay, so for example, you have a store selling sweaters. All of your seaters have a specific part number based on size, color and style. You have some choices. You could create a separate page for every part number. However, this quickly becomes a daunting task for you, and an impossible site to navigate for your customers because you could have 200 separate product pages all for the same sweater, with the only difference being size and color.
Instead, you could create a "parent" page that is just for this one particular style of sweater. You create "children" pages for all the possible sizes and colors. You then allow your customer to select size and color either via dropdown menus, charts or whatever seems best for a particular product. You set all these product pages as either "children" of the parent product or attach their part number to specific options, so that when that option is chosen that part number goes in the cart. The customer never actually sees an individual product page for that color and size of sweater, it simply exists in the back end as a means of allowing your customer to pick specific items from your inventory.
So, you see, because you created (technically) separate product pages, you technically have a whole bunch of URLs but all circling around or connected to the parent page. The individual part number "pages" are like spokes on a wheel connected to a parent "hub" page.
Now, all that being said...a hub page on a content site can follow the same principle, however for completely different reasons. This even happens in e-commerce. For example, say you sell clothing. On your site, you also have size charts. From every clothing page you link to your size chart page. In that case your size chart page becomes a "hub." Hub pages tend to outrank other pages because you are pointing to them with lots of your pages, indicating to both visitors and search engines that they are somehow especially significant.
So, on the one hand a hub page can be used for online merchandising, on the other it can be used as an important reference point for visitors. The simplest version of a hub page would probably be a main category page on a Website.
This is really my own viewpoint. I have had extremely good results ranking well for hub pages. I am interested to know what others think and how they explain the concept.