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.
The DigitalOcean API lets you manage DigitalOcean resources programmatically using conventional HTTP requests. All the functionality available in the DigitalOcean Control Panel is also available through the API.
doctl is a command-line interface for the DigitalOcean API and supports many of the same actions.