NAT Gateway is Network Address Translation Gateway.
An EBS Snapshot is a point in time backup of an EBS volume. It is stored in S3.
In order to restore an EBS Snapshot, we need to create a volume using the snapshot and attach it to an EC2 instance. Finally mount the volume in the EC2 instance.
S3 is Simple Storage Service which is a storage service in AWS.
NFS (Network File System) Protocol is a file sharing protocol, that defines how the files can be shared across networks. It allows the users to access the remote files as if the files are in their local storage.