What does it mean to take 50 beautiful photos digitally (15 photos)?

There are no negatives taken by traditional digital cameras. Generally, "negatives" are recorded on optical discs in the form of data, which can be viewed by a computer, taken to a digital printing shop or directly developed, just like pictures on the Internet. 50 intensive photos means that you can choose 50 photos from dozens or hundreds of photos and give you PS processing for free. "15 photos included in the book" means that 15 photos are selected from 50 photos and designed into an album. There are several places where money needs to be added: first, the general photographer will judge your spending power and take a certain number of more photos, and then you will have to add money if you choose more than 50 photos. Second, if you want to make an album other than 15 pictures, you have to add money to make extra pictures.