Volumes is a high-performance block storage service provided by DigitalOcean that allows users to increase the storage capacity of their Droplet virtual machines independently of CPU and memory. It provides low latency, high IOPS, and high throughput for demanding workloads. Volumes can be used for various use cases such as websites and web apps, distributed web applications, backups, log files, AI/ML, and more. The service has a 99.99% uptime SLA and is suitable for growing businesses that need to increase their server capacity due to increasing application needs.