Excuse me for my ignorance, but what are affiliate links? I never got to experience the early web.
https://en.wikipedia.org/wiki/Link_page
Or maybe they meant webrings?
It's either webrings or those widgets that people used to have in their blogs that were called things like "friends sites", "interesting sites" or things like that. (I used to have one but can't remember the name I gave it)
This made them a very easy way to find new sites and communities, especially in fandoms like the ones for the Legend of Zelda, Pokemon, etc.
You can see a working example in the right column of this longtime Pokemon site:
https://www.dragonflycave.com/
With all those tiny buttons and what not.