Amazon EBS
Elastic Block Store — persistent block storage volumes attached to EC2 instances.
Amazon Elastic Block Store provides persistent block-level storage volumes that attach to EC2 instances over the network, behaving like a raw hard drive. Unlike instance store volumes, which are physically attached to the host and lost when an instance stops or terminates, EBS volumes survive instance stops and can be detached and reattached to another instance in the same Availability Zone.
A key exam nuance is that an EBS volume can only be attached to one EC2 instance at a time in standard configurations (Multi-Attach is an advanced io1/io2 Provisioned IOPS feature not emphasized at the practitioner level). Snapshots back up EBS data to S3 incrementally and can be used to restore or copy volumes across Availability Zones.
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