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What does "Dockerfile" mean in programming?

Dockerfile is one of the most common terms in software development. This guide explains what it means, how it is used in practice, and why it matters, with real examples from the developer world.

Definition

A text file with instructions to build a Docker image automatically. Each instruction in the Dockerfile creates a layer in the image, and the final image is assembled by stacking those layers.

Example

"We added a multi-stage Dockerfile to keep the production image small."

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