AdWords allows users to advertise on which of the following?

While Google Search is a platform where AdWords (now known as Google Ads) allows users to advertise, the most comprehensive and accurate understanding of AdWords is that it encompasses advertising on both Google Search and the Google Display Network. When using Google Ads, advertisers can create ads that show up in search results, but they also have the option to display ads on a vast network of websites through the Google Display Network, which includes millions of sites, blogs, and apps that have partnered with Google to show ads.

Google AdSense is a program that allows website owners to earn money by displaying ads provided by Google, but it is not a platform where users create their own advertising campaigns. DoubleClick Campaign Manager is a tool for managing display ad campaigns and tracking performance; while related to advertising, it doesn't serve as a direct platform for AdWords users.

Therefore, the most inclusive answer regarding where AdWords can be used for advertising is both Google Search and the Google Display Network, making the mention of Google Search alone too narrow to fully capture the intent of AdWords.