I see that the ads that run on my sites and others are simply Keyword Anchor Text Ads. So why do I have to write a description when I am creating an ad
There is an option to show the description which some sites do but I think most just show the simple links.
So, the ad publisher choses whether, or not, to include a description. And 95% of publishers just go with Anchor only.
I don't know the percentage but basically yeah. When the publisher puts the code on their site they can choose the number of ads and the format.
That's right. On my site I see something like this MPAA | Charity | San Francisco Hotels | Horoscopes | MPAA My ads are displayed the same way. Not the format.