Can you explain what is meant by Docker Volume and what it is used for?

Docker Volume is a mechanism in Docker for persistent data storage, allowing containers to save and use data outside their lifecycle. Unlike data stored inside a container, which disappears when the container is deleted, data in a Volume is preserved and can be used by multiple containers.

Main purposes of Docker Volume:

• Data persistence across container restarts — for example, databases store their files in a Volume.
• Shared access to data among multiple containers — several containers can read and write to the same Volume.
• Isolation of data from host filesystem — Volumes are managed by Docker and located in a special directory on disk.

Example of creating and using a Volume:

docker volume create mydata

docker run -d -v mydata:/var/lib/mysql mysql

Here, a Volume named mydata is created and mounted into the container at /var/lib/mysql for MySQL data storage.