Hello
At last a topic I can get my technical teeth into!!!
There are companies who serve ads (called impressions).
When you setup your own website using (for example) yahoo, you can ad in space where your ads will be ran, these ads can be served by google or other companies filling that ad space.
If you will, its like I setup my shop and someone drops by put posters in my window.
I get paid for allowing the space to be used, the person who puts it up is getting paid by the person who wants the ad out there.
If Im selling a new gadget I could go to a company like
netshelter or
cnet.com
or if I wanted to sell womens shoes, I could use
Covering the latest beauty and fashion trends, relationship advice, wellness tips and more - all from the Glam experts since 2003.
www.glam.com
These companies have a network of affiliates with whom the server ads to.
So , I would pay the likes of cnet x dollars to put impressions on websites affiliated with their network, and I am assuming that cnet is putting this to a targetted bunch of people who may be interested.
So, in this case,
about.com being a general non religious question site, will serve ads based on interest on behalf of, in this case, the Mormons.
About could be tasked with serving ads on mormonism to any computer browing anything based on religion, or it could target keywords to get specifc end users, i.e. they could be targetting anyone who is searching using the work catholic.