Disney PhotoPass photographers are all throughout the parks ready to take your picture, some character interactions also have PhotoPass photographers. These pictures will be uploaded online for you to view. Memory Maker is the package which allows you to download and share the PhotoPass pictures. As the PP mentions, there are pros and cons, but when we used it we absolutely loved it. It also played in to our decision to get an AP for our next trips as it is included in the price of the AP. If you are going to do it, please note that you receive a $30 "discount" if you purchase it 3 or more days before the start of your trip.