All the data you need to help focus on a certain section of online users that can bring in revenue is available in Google Analytics. The Google Analytics Remarketing feature will help you to use your ads in a more targeted manner. You will be able to define your target audience in several ways, like users interested in a particular category of products, users who repeatedly visit your site, users who behave in a particular manner when they are on your site, etc. After creating the remarketing lists in Google Analytics, the tool will allow you to use the lists in your Google ad campaigns. Before you create any list you need at least 100 users on it.
Import segments such as Google PPC traffic
or from any goal like high average time on site
Another example could be a list of users containing those who have completed a transaction can be used for ads talking about discount codes. You should also specify, when you create a list, how long you want a user to remain on that list. You can specify a time period of up to 540 days. You can also create lists based on audience segments available under All Sessions of the Reporting tab.
Make sure Adwords and Analytics are linked through the linking tab in admin of Analytics. The e-mail admin in Adwords must also be present in Admin of Analytics for this to work.