his format is considered more environmentally friendly due to the reduction of paper and energy use. These editions also often feature interactive elements such as hyperlinks both within the publication itself and to other internet resources, searching and bookmarking, and can also incorporate multimedia such as video or animation to enhance articles themselves or for advertisements. Some delivery methods also include animation and sound effects replicating page turning to further enhance the experience of their print counterparts.Traditionally, magazine publishers have relied on two revenue sources: selling ads and selling magazines.