====== EFS (Elastic File System) ======

**What it is:** A managed file system that can be mounted by multiple instances at the same time (NFS).

**What it’s for:**
  * Shared storage for fleets of EC2 instances or containers.
  * Content management, shared app files.

**Key ideas:**
  * Unlike EBS (attached to one instance), EFS can be shared by many.
  * Typically used inside a VPC with mount targets per AZ.

**Exam cues:**
  * “multiple EC2 instances need shared file system” → EFS.

**Hard words:**
  * *mount* /maʊnt/: gắn (file system vào máy)
  * *shared* /ʃerd/: dùng chung
  * *fleet* /fliːt/: một nhóm lớn (nhiều máy)