what are CPA ads? what are the different types of ads technologies available?

what are CPA ads? what are the different types of ads technologies available? ANSWER TO THE ABOVE QUESTION CPA means Cost per action or Cost-Per-Acquisition. It means that you will pay only when there is conversion of your displayed add in to a profitable action happens. Most ad networks are starting to offer CPA ad slots and have terms of their own. Chitika has some sort of CPA https://chitika.com/support/index.php?_m=knowledgebase&_a=viewarticle&kbarticleid=135 check the below discussion on google CPA ads. http://www.google.com/support/forum/p/AdWords/thread?tid=55436596ac004b95&hl=en Other conventional advertising options available are CPC - COST PER CLICK (you pay per click) CPI - Cost per impression (you pay per impression. Generally paid for 1000 impressions) Popup adds (Popup adds) . http://forums.digitalpoint.com/ has these type of adds.