You can then double click this virtual drive itself to open its contents in a new Finder window. This usually looks like a white hard drive.
The image mounts as a new volume on your desk top. To open a disk image, you just double click on it. They store files in a way that acts like one of these data storage devices. Disk images are a kind of virtual disk-like a CD or DVD or even a hard drive. If you've ever downloaded a DMG file from a website, you've dealt with a disk image.
