An Amazon Elastic Block Store (EBS) volume is often described as a “virtual hard disk
in the cloud”. EBS volumes are block-level storage volumes that are attached to EC2
instances much as you would attach a virtual hard disk to a virtual machine in a virtual
infrastructure
An Amazon EFS filesystem is a file-level storage system that is accessed using the NFS
protocol. Filesystems are mounted at the file, rather than the block level and are
therefore not similar to a virtual hard disk
Amazon S3 is an object-level storage service and is not mounted or attached. You use a
REST API over HTTPS to access objects in an object store
An Amazon Elastic Network Interface is a networking construct, not a storage
construct