Block storage volumes are network-based block devices that provide additional data storage for Droplets. You can move them between Droplets and resize them at any time.
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.