Persistence
Noun · Development
Definitions
The characteristic of data that survives beyond the lifetime of the process that created it, typically by being written to durable storage such as a database, filesystem, or message log. Without persistence, all application state is lost when the process terminates.
In plain English: Saving data so it's still there after the program stops running, like writing something down instead of just remembering it.
Example: "We added Redis for caching but we still need PostgreSQL for persistence — Redis data doesn't survive a restart unless you enable AOF."