A Docker image is a read-only template containing application code, runtime, libraries, and dependencies. A Docker container is a running instance of an image. Key differences:
Images are immutable blueprints; containers are mutable runtime environments
Images are stored; containers are executed
Multiple containers can be created from a single image
Changes to containers don't affect the original image Example:
# Image exists as a template
docker images
# Container is created and runs from image
docker run nginx
Rewriting in plainer words…
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