As you may know about our machine learning and artificial intelligence capabilities, Cerkl knows your subscribers' explicit and implicit interests. Subscribers select their favorite categories when they personalize their newsletter experience (explicit interests), and they open and click on certain material which they may not have indicated during the personalization process (implicit interests).
The statistic labeled Top 5 Interests in your Individual Subscriber Metrics (Insights > Subscribers) is each subscriber's top five favorite organizational categories based on their engagement (which is scored right behind the category), both explicit and implicit interests. The more a subscriber clicks on material that's tagged with a certain category, the more the score rises. In the example below, Joe has clicked on stories tagged "Generating Content" more than any other category. Hence, that category has his highest score.