Audience Overview
Use Lists to organize users and create segments of your audience that you can message and track. Maintain Natural Lists as repositories for your users, then use Audience Builder to further segment and report on your audience, grouping users into dynamically updating Smart Lists based on highly-customizable filters. Filters can leverage a wide range of user data that you pass to the system or which is produced automatically, such as user engagement levels, user locations, or other behavioral data.