If you want to sell ads on your blog, you have quite a few options available to you, ranging from pay-per-click ads to affiliate ads to direct ads and more. Here’s a quick rundown of the most common type of ads that bloggers use to make money—

Direct ads: Direct ads are pretty much exactly what they sound like; a space on a blogger’s site where advertisers can place their ad for an agreed upon price per month. Usually, this ad is displayed in the form of a banner, and the price is dependent upon a number of factors, including the number of page views per month.

Pay-per-click ads: Again, there’s no misnomer in the name of this type of ad—site owners (bloggers) are paid an agreed upon rate each time that a visitor to the blogger’s site clicks the advertiser’s ad.

Affiliate ads: An affiliate ad can be a pay-per-click ad, and simply refers to the fact that it’s an ad that gives the blogger a choice of ways in which to provide links to the advertiser’s product. When a user purchases the advertised product, the blogger is paid.

Pay-per-impression: In a pay-per-impression type of ad, the advertiser will pay the blogger (site owner) for each and every time that their ad appears on the blogger’s site.

Other types of ads include reviews, contextual ads, text link ads, and pay-per-action ads. However, the ones above are the most common and typically the most lucrative.

Source- http://help.outbrain.com/