Custom images are Linux and Unix-like images you import to DigitalOcean. You can create Droplets based custom images, which lets you migrate and scale your workloads without spending time recreating your environment from scratch.
Once you upload a custom image to your DigitalOcean account, you can create Droplets based on that image. When you upload a custom image, you select a region for it to be available in. You can create Droplets based on a custom image in that region, and you can make your custom image available in additional regions at any time.