Click Focus in Engagement Emailing focuses on the URLs you have used in the email campaigns you have sent. The tool will analyze the campaigns you have chosen and make available to you a couple of more options.
You can first create a list of contacts that have clicked on any of URLs you have chosen. This will allow you to target everyone that has actively clicked on any link to engage contacts that have an interest in your emails.
To be more detailed in analyzing your email, you can choose to create lists based on all of your URLs. The tool will analyze the campaigns you have chosen, then all of the URLs you have chosen, then create a list of contacts that have clicked on all your emails.