What it is: Block storage volumes attached to EC2 instances (like virtual disks).

What it’s for:

• Persistent storage for EC2 (OS disk, data disk).
• Databases hosted on EC2.
• High IOPS workloads depending on volume type.

Key ideas:

• EBS volumes are tied to one AZ (you can snapshot and restore elsewhere).
• Backups are done with Snapshots.

Hard words:

• *block storage* /blɑːk ˈstɔːrɪdʒ/: lưu trữ dạng khối (disk)
• *persistent* /pərˈsɪstənt/: bền vững (không mất khi reboot)