2. Pay-per-impression: The company advertiser pays the blogger each time the ad appears on the blog's page. It is measured by CPM, or Cost Per Mille, this is the what the advertiser pays per thousand views. In order to maximize the ad pay you get, you can look around for a high quality ad network, one that will place good ads with optimized copy. Low quality ad networks often drop views.
3. Cost Per Action : also known as pay per acquisition (PPA) here the advertiser pays the blogger each time someone clicks on the ad and performs an action such as signing up on newsletter, registration, or online purchase.
Google AdSense which is the most used monetization platform for bloggers and website owners uses Contextual ads. It is a form of targeted advertising for advertisements appearing on blogs or websites depends on its contents. The ads shown should be related and relevant to the content and topic of the page to increase the chance that the user will click on them.
There are also Direct ads which usually shown as banner ads on blogs and websites. This in another option for bloggers and website owners to sell advertising space on their blogs.