<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2014) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2014) (Learn how and when to remove this template message) </Td> </Tr> <P> In computer science, persistence refers to the characteristic of state that outlives the process that created it . This is achieved in practice by storing the state as data in computer data storage . Programs have to transfer data to and from storage devices and have to provide mappings from the native programming - language data structures to the storage device data structures . </P> <P> Picture editing programs or word processors, for example, achieve state persistence by saving their documents to files . </P>

What does it mean to say data is persistant
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