Data is an integral part of any application and typically defines the state of an application at any given point of time. Persistence is the characteristic of an application state that outlives the process that created it. Absent persistence, application data would be lost when the application terminates. If a banking application could not persist information about the accounts, that application would be useless. Similarly, if a retail store application could not persist information about the inventory, customer orders, and shipments, it would be of no value. Persistence allows applications to access the data and perform ...