Elastic Block Store, EBS, is one of you storage options when you deploy instances. It is somewhat like a network drive, your EBS can stand by itself until you attach it to an instance. You can set the EBS to terminate on instance termination otherwise the EBS can be moved freely across instances along with the data it contains. Generally you can only attach one EBS to one instance but one instance can have multiple EBS. Your EBS is locked to the availability zone it is created in.