How does remarketing work? - AdWords Help
Remarketing allows you to reach users who visit your website and show ads to them as they browse the Web. A remarketing list represents people you'd like to re-engage with a compelling message.
How does this work?
A small piece of code (remarketing tag) is embedded on your homepage, for example. This code tells AdWords to save visitors to your "Homepage List." As people visit your homepage, their cookie ID is added to the remarketing list. Then, you can create an AdWords campaign that targets messages only to people who are on this list as these people browse the Web. Your remarketing messages won't be shown to people who aren't on the "Homepage List."
Has anyone tried using this feature?