There are various ways to store your digital photographs. You can keep them on your memory card, if it is designed for storage, or you can download the images onto your computer hard drive or onto disks or DVDs. Computer disks are data storage devices that come in various sizes with assorted amounts of memory. They are capable of saving hundreds of photos on them. They are ideal for storing your images if you want to back up the photos from your hard drive.
Disks are also good if you want to make copies for your friends and relatives and if you want a portable set of photos. If you have them saved to a disk you can more or less take them with you and view them on any computer.
You can get permanent, one time usage disks as well as rewriteable disks. They generally cost about a dollar or less per disk, depending on the size.