Your client wants to show ads to people who’ve visited her website before. Which AdWords feature would you recommend she use?

Remarketing
Ecommerce tracking
Dynamic search ads
Conversion tracking

Explanation: Remarketing helps you reach people who have visited your website or used your app. Previous visitors or users can see your ads as they browse websites that are part of the Google Display Network, or as they search for terms related to your products or services on Google. Read more here

See all AdWords Fundamentals Questions and Answers here.