There are essentially two methods of paying for online advertising. One is to pay every time your ad is seen. The costs are generally determined per thousand times the ad is seen, which is abbreviated as CPM or Cost Per Thousand (M being the roman numeral for 1,000). The other is to pay per click or PPC. If you advertise on Facebook or most content sites you general pay on a CPM basis, though you can certainly pay per click. If you advertise with a search engine like Google, you generally pay per click, which is beneficial in that you can advertise a number of products, including those you rarely sell, and only pay when someone takes interest enough to actually click on that ad. The folks at Forthea have put together this infographic showing why PPC is so effective.
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