1. Block Storage

• Stores data in fixed-size blocks (e.g., 512B, 4KB).
• OS sees it as a raw disk; you add a filesystem (ext4, NTFS) on top.
• Good for low-latency, random read/write workloads (OS disks, databases).
• Example: EBS, local SSDs.

2. File Storage

• Stores data as files in a directory hierarchy.
• Accessed via file protocols (NFS, SMB).
• Supports file-level operations (read, write, lock).
• Good for shared access and apps needing POSIX filesystem.
• Example: EFS, Amazon FSx.

3. Object Storage

• Stores data as objects (data + metadata + unique ID) in a flat namespace.
• Accessed via APIs/HTTP, not mounted as a traditional disk.
• Highly scalable, but not for low-latency in-place updates.
• Good for large, immutable files (images, backups, logs).
• Example: S3.