Many of the smaller point and shoot cameras allow you to access your camera's memory card through a USB cable connection. However, most DSLR cameras do not have this access port. Therefore, you need a CF card reader copy your pictures to your computer. This is important if you want to edit them in Photoshop. CF card readers are a fast and easy to use. All you need to do is pop your CF memory card inside, and insert the other end into a free USB port. You can find many cheap CF card readers at any wholesale merchant, and many can be used with multiple cards.