Search Engine Optimisation - Pay per click (PPC)
Pay per click (PPC) is a method of Internet advertising for websites, which entails advertisers paying their Wesite advertising Hosts only when their ad is clicked. Search engines force advertisers to bid on keywords or key phrases, which are relevant to their target audience or market. More - http://www.reason8.com/build-website/index.cfm/2009/12/1/Optimisation-or-PPC
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