When a CM photographer takes your picture, they give you a little card called a photopass. Then, every subsequent time your photo is taken by a photographer, you hand them your photopass, and your picture is stored according to the number on your pass. When you are done with you trip, you take your photopass to certain locations in the park to view (and purchase) your photos. You can also view them on line, and purchase a CD containing the photos as well as other merchandise. here's a link to the photopass website: www.disneyphotopass.com