In the parks at various locations are photographers. When you have your first photo taken by one of them they will give you a card the same size as a credit card. Keep it with you and whenever you have a photo taken hand them the card and they will scan it. I can't remember how many each card holds but I think it's around 300 - not sure. You can have more than one card and when you are ready to have them developed there are several locations around Disney where you can go - the photographer will tell you where. We had ours done in Epcot. You can either have a few photos developed but each one costs around $13 or you can have them all put on a cd for $99. If you have more than one Photopass card (like we did) they just put them all together. We went for the cd and thought it well worth every penny! When they put cute borders or 'Magic Kingdom 2006' on it they look great!