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Definition of CPC in online advertising

CPC is the Cost per click when buying CPC.

See the definition of a click.

When buying CPC from an ad network, the network usually converts the CPC bid to CPM (or RPM) in the background, via the historical or predicted Click-through rate, so the network can optimize their CPM. The ad networks inventory is after all ad impressions, which they want to get most out of.

In order to get a relatively high volume of ad impressions when buying CPC you need to make sure the ads is relevant and inviting to be clicked on. Low click-trough rates will make the ad network anticipate a low CPM for your campaign, which in turn gives the ad network a low revenue per impression, and they are likely to prioritize other competing campaigns.

A similar metric is PPC, or Pay per click.

See also definition of eCPC, definition of CPM and definition of RPM.

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http://cpm.wiki/define/CPC