Volume

Definitions

A persistent storage unit managed by a container runtime (such as Docker or Kubernetes) that exists independently of any single container's lifecycle, allowing data to survive container restarts, removals, and re-creations.
In plain English: A storage space that keeps your data safe even when the application container it belongs to is deleted and rebuilt.
Example: "The Postgres data is on a named volume so we can blow away the container and spin up a new one without losing the database."