Deepika, Experience Fragments are part of Adobe Experience Manager and seem to be different from the new feature in Campaign called Fragments. AEM also has something called Content Fragments which lives in Assets.
It would be nice if AEM let us create an experience fragment using an email experience fragment template and then be able to use that EF with Campaign. It would also be nice if the content fragments stored in Assets were interchangeable with the Campaign fragments. I don't think either of those AEM features are available in the new Campaign creative designer, but it would help if Adobe could explicitly tell us if they can work together.