What is the difference between an image and a volume in Docker?

In Docker, an image is a template from which a container is created. The image contains all the necessary layers with applications, dependencies, and configurations. It is immutable and serves as the basis for running containers.

A volume is a mechanism for persistent data storage outside the container. Volumes allow data to be preserved even when the container is deleted and can be shared between multiple containers.

Example:

• An image is like a template of a virtual machine.
• A volume is like a separate disk or folder where data, such as a database, is stored.

Thus, an image is the code and environment, and a volume is a place for data.