Advertising on Internet

There are many ways by which advertising slots can be purchased on Internet like CPM, CPV, CPC, CPA, CPL and CPO. CPM or cost per mil means that the advertiser is meant to pay for a particular number of people to whom the advertisement will be exposed.
CPV or cost per visitor means that the advertiser is meant to pay for the people to whom the advertisement was delivered. CPC or cost per click means paying for the number of clicks made on the advertisement by the visitors. Although the advertisement is put up on the website, the amount is paid only after the visitor clicks on the URL of the advertisement. CPA or cost per action means that the advertisement publisher bares all the charges of advertisement, but he gets paid only if the visitor clicks on the advertisement and purchases a product or signs-up for a service. CPL or cost per lead is similar to CPA, only that the visitor doesn’t have to necessarily buy anything; he or she can simply apply to get regular newsletters and special offers. CPO or cost per order is where the advertiser pays each time an order is placed.

Online advertisements cannot only be used to promote a product or service but in fact they can be used for purposes like promoting charity and spreading education.