Google Ads is an online advertising tool that allows businesses to display ads on Google Search, websites, and devices. There are three payment methods for Google Ads: cost-per-click, where advertisers pay when someone clicks their ad; cost-per-thousand viewable impressions, where advertisers pay for every thousand times their ad is seen; and cost-per-view, where advertisers pay for each view of their ad. The document provides an overview of Google Ads and how businesses can use it to advertise online through different platforms and devices.