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Images vs Containers

The blueprint vs the running instance

Step 1 of 3

What is an Image?

An image is a read-only template with instructions for creating a container. Think of it like a class in OOP or a recipe. Images are built in layers — each Dockerfile command creates a new layer.

bash

docker pull nginx:latest

Application codetop layer

Dependencies

Config files

OS packages

Base OS layerbase layer