There are catalogs for each of the categories I listed. Each catalog has a list of web sites for that category (for example, for technology, you'd find engadget, gizmodo, gigaom, verge and more. You can choose a number of web sites you'd like to follow, adding them to your own list under a given tab. When you click on a tab,you are presented with rows of pictures (one row for each site you've selected for that category) each relating to an article on that site. Click on a picture and the article is displayed. If there are more pictures than will fit on the screen, you can scroll sideways to reveal them. Kind of a poor explanation but hopefully you get the picture. You have to try Pulse in order to really understand it. I like it a lot.