GraphicRiver - E-Publishing & Print Newsletter

Hello Forum,

  1. I don’t understand what are these items.
    http://graphicriver.net/category/epublishing

Can anybody tell me what are these and Why and Where they are used?

  1. And the Print Newsletters and Bi-fold brochures are same … Isn’t it?
    http://graphicriver.net/category/print-templates/newsletters

Thank you.