Google's 2017 Annual report
Mountain View, California, U.S.
As per its 2017 Annual report, Google generates most of its revenues from advertising. This includes sales of apps, purchases made in-app, digital content products on google and YouTube, android and licensing and service fees, including fees received for Google Cloud offerings. 46% of this was from clicks (cost per clicks), amounting to US$109,652 million in 2017.