A digital camera takes pictures that can be printed from a computer. However, cell phone pictures can also be printed from the computer. Depending on what kind of a printer you have, there is an option to hook your phone right up to the printer via Wi-Fi, and print right from your phone. However, a digital camera is usually the best option if you want to use a computer to print the pictures out.
The digital camera often has an SD card that stores the pictures. That SD card is put into a specific slot on the computer, and the computer reads the photos. You can save the photographs to your computer, a flash drive, or an external hard-drive, depending on how much space you have and the number of photos you have.