Pay-per-click (PPC) advertising has been the standard-bearer in online advertising models. It all started with the Google search engine that began using keywords that people searched in their engine to determine where to place ads through a content-generated ad placement system.

By combining the power of the Google search engine and tracking keywords, advertisers could set up ad campaigns based on very highly targeted niche topics. This insured that when an ad showed up on a site, it was relevant to the audience, who would be more inclined to click on the ad since it would interest that demographic.
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