Final answer:
The best display campaign marketing objective for reengaging with users that have already shown interest is retargeting, which uses cookies to track users' online behavior and display targeted ads based on their previous actions.
Step-by-step explanation:
The best display campaign marketing objective for reengaging with users that have already shown interest is retargeting. Retargeting allows advertisers to target ads specifically to users who have previously interacted with their website or shown interest in their products or services. This helps to remind those users about the brand and encourage them to take further action, such as making a purchase or signing up for a newsletter.
Retargeting works by using cookies to track users' online behavior and then displaying targeted ads to them based on their previous actions. For example, if a user visits a website and adds a product to their shopping cart without completing the purchase, the website can use retargeting to show ads for that specific product to the user on other websites they visit.
By using retargeting as a display campaign marketing objective, advertisers can effectively reengage with users who have already shown interest, increasing the likelihood of conversion and driving more sales.