Passage: 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. This includes three principal methods, namely AdMob, AdSense (such as AdSense for Content, AdSense for Search, etc.) and DoubleClick AdExchange.For the 2006 fiscal year, the company reported $10.492 billion in total advertising revenues and only $112 million in licensing and other revenues. In 2011, 96% of Google's revenue was derived from its advertising programs. In addition to its own algorithms for understanding search requests, Google uses technology from the company DoubleClick, to project user interest and target advertising to the search context and the user history.In 2007, Google launched "AdSense for Mobile", taking advantage of the emerging mobile advertising market.Google Analytics allows website owners to track where and how people use their website, for example by examining click rates for all the links on a page. Google advertisements can be placed on third-party websites in a two-part program. Google's AdWords allows advertisers to display their advertisements in the Google content network, through a cost-per-click scheme. The sister service, Google AdSense, allows website owners to display these advertisements on their website and earn money every time ads are clicked. One of the criticisms of this program is the possibility of click fraud, which occurs when a person or automated script clicks on advertisements without being interested in the product, causing the advertiser to pay money to Google unduly. Industry reports in 2006 claimed that approximately 14 to 20 percent of clicks were fraudulent or invalid.

Question: What company allows ads to be displayed on networks?
Google