In cloud computing, block storage is a network-based way to store data. Block storage services, like DigitalOcean Volumes Block Storage, provide similar behavior to traditional block storage devices, like hard drives.
Cloud-based block storage functions like typical disks. You can format one with a filesystem, configure programs to write to it, and combine multiple devices into a RAID array.
Network-attached block storage devices often have some unique advantages over traditional hard drives, like taking live snapshots of the entire device for backups, resizing for more storage space, and simple ways to move storage between machines.