Google Ads is Google's paid advertising network that displays images and text ads through its Google Display Network. To set up a remarketing campaign all you need is a Google Ads account and a simple snippet of Google remarketing code, which is also known as a tag, embedded in your website. You can then use your Google Ads account to create an ad campaign. When someone visits your website pages, a cookie is placed in their browser. Later, depending on the configuration of your campaign, they will see your ads across a wide variety of websites while they're browsing.