Rechargeable batteries are far more convenient. Some cameras come with a battery and a battery charger as well. How long a charged battery lasts depends on how you use your camera. Some features that you use on your digital camera eat away at the battery life faster than other features. If you have a camera with an internal memory, after taking your photos, the camera will indicate that the memory is full.
Some cameras save photos onto flash or media cards.
The cards come out of the camera and fit into an adapter that then fits into your 3.5inch disk drive. With cameras that save photos onto diskettes, the process is even easier. Just pop the disk into your disk drive and you're all ready. The process of transferring images from your digital camera to your computer doesn't always have to involve a cable. There are also printers made with a built-in card reader.