All 7 Amazon EFS (Elastic File System) questions
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What are the different storage classes available in EFS? How do EFS mount targets work across multiple Availability Zones? How does EFS ensure data durability and availability? How can you control access permissions for files and directories stored in EFS? How does EFS integrate with AWS Lambda and containerized workloads like ECS? What performance modes and throughput modes are available in EFS, and how do you choose between them?
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What is Amazon EFS and how is it different from Amazon S3 or EBS?

Beginner

Answer

Amazon EFS is a fully managed, elastic network file system that can be mounted concurrently by multiple EC2 instances at the same time, automatically growing and shrinking as you add or remove files, unlike Amazon EBS which attaches to only one EC2 instance at a time, and unlike Amazon S3 which is an object storage service rather than a traditional file system with folders and file locking behavior.
sudo mount -t efs fs-12345678:/ /mnt/efs
Real-world example A content management system running on multiple EC2 instances behind a load balancer uses EFS so every instance can read and write to the exact same shared set of uploaded files simultaneously.

Common follow-ups: Can EFS be mounted from instances in different Availability Zones?;What is the difference between EFS and FSx?

S3 & Storage;EC2 & Compute
All 7 Amazon EFS (Elastic File System) questions