એક Docker image એક read-only template છે (એક packaged application તેની dependencies સાથે); એક container એ image નો running instance છે। આ સંબંધ ક્લાસ અને object જેવો છે: એક image બહુ બધા containers બનાવી શકે છે।
Image vs container
IMAGE → a read-only TEMPLATE: the app + dependencies + config, built in layers
(like a blueprint/class; stored, shared, versioned)
CONTAINER → a RUNNING INSTANCE of an image (with a writable layer on top)
(like an object created from a class; has runtime state)
One IMAGE → many CONTAINERS (run the same image multiple times)
