A data volume is a specially-designated directory that is located outside of the root filesystem of a container (i.e. created on the host), designed to persist data, independent of the container’s life cycle. This allows sharing data within containers by importing volume directory in other containers.
Data volumes provide several useful features :
* Data volumes persist even if the container itself is deleted.
* Data volumes can be shared and reused among containers.
* Changes to a data volume can be made directly.
* Volumes can be initialized when a container is created.
