EFS is a fully-managed service that makes it easy to set up and scale file storage in the
Amazon Cloud. EFS uses the NFSv4.1 protocol. Can concurrently connect 1 to 1000s of EC2
instances, from multiple AZs
EBS volumes can only be attached to a single EC2 instance at a time and are block devices
(not NFS)
Amazon S3 is an object store and is connected to using a RESTful protocol over HTTP
Amazon Instance Store is a type of ephemeral block-based volume that can be attached to a
single EC2 instance at a time