If you look at the Internet a few years back, you’ll see that advertising was done in a way that was very similar to other types of media like television, or actually, more like what you see in a newspaper.
You’d enter a site, and in some location you’d get to see a banner (often these were quite numerous and very large), which would present and ad for whatever company was paying for adds on your space.
But there was one problem with this kind of advertising. It really wasn’t exploiting the fact that the adds weren’t in some newspaper, but were instead presented over the Internet.