That entirely depends on the type and setup of your ad. Search Ads specifically appear above or below organic search results on Google, Bing, and other search partners. Display Ads are banners, videos, or rich-content ads displayed on other websites that agree to show them. You can select which websites your display ad shows on based on topics, keywords, and other factors. Remarketing Ads are display ads that are only visible to customers that have visited your website before. Again, you can choose where and when they appear as needed.