When designing a digital product you have to consider the layout of the text, images and other elements. I have created a digital product and published it on issuu.com. For this I had to decide where the text and images were to be placed. With a digital book you can do a double page spread and not have to think about the elements of the pages disappearing in to the gutter. On digital books it is possible to zoom in and translate words. There are some links that can be put in to the digital publications so that you can go from one page to the next or even out of the document to other publications of web sites.