PPC stands for Pay Per Click.
RPC stands for Revenue Per Click.
If you were promoting a PPC offer, Pay Per Click means that you would get paid each time a user clicks on your ad or sponsored link. It’s by far the fastest way to earn money! However, the amount you would typically earn per click is comparatively low when compared to CPA payouts.
For additional terminology and key performance indicators for measuring success, please see:
ALL ABOUT MEDIA BUYING PART 1 – PLAYING WITH TRAFFIC
ALL ABOUT MEDIA BUYING PART 2 – TRAFFIC MONETIZATION