Elastic File System is simple, scalable and elastic file storage system for our EC2 instances. It is analogous to NAS (network attached storage), which is a file-level data storage connected to a network.

It is elastic in manner, as the storage size increases or decreases elastically with data size in our storage.  It provides low and consistent latency regardless of file system size. Although, IOPS and throughput vary with data size in EFS. It is highly scalable too as it can grow to petabyte scale.

One key feature of EFS is that it can be mounted to thousands of the EC2 instances irrespective of its size, location, and availability. It is highly available and accessible across various availability zones. It provides data consistency to all attached EC2 instances.