If you head over to gallery you will see many pictures with two arrows on either side. These form what's called a "carousel", a revolving display of pictures. These allow for many images to be in the same space, so they don't clutter the view. Also, the user is not forced to view these images, they have the option to cycle through them.
You are reading about module tabs... in a module tab!!! This element allows for compartimentalization of space and organizes elements more efficiently.