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PPC or Pay Per Click is a billing model for online advertising. It is not specific to Google Ads, and is used by many other online advertising platforms such as Facebook, Linkedin, Yahoo and Bing, amongst others.
Google Ads uses PPC as its primary billing model across Search, Shopping and Display. YouTube which is also covered as part of Google Ads, charges when videos are watched not clicked. It is also possible to choose a billing model for Display that charges for impressions instead of clicks.