If you have added an offer, a product or any links to your email campaign - you are able to see not only which one was the most popular but who clicked on the links.
This is extremely clever and profitable knowledge as it allows you then to send another campaign to further entice your customer to that product, whether it's offering them a discount or further information about that product or service - you can even create a new lead from them.
If you want to add the contacts that have clicked specific links to a group (so you want to send that specfic discount to win the lead) you can, all you have to do is click on the Link and it will allow you to add them to an exsisting group or a new one.