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A Dockerfile is a text file that contains all the commands a user could run on the command line to create an image1. A Dockerfile is composed of instructions that specify the parent image, the packages to install, the files to copy, the ports to expose, and the commands to run2. A Dockerfile can be used to build a Docker image with the docker build command3. References:

Dockerfile reference | Docker Docs

What is a Dockerfile? A Step-by-Step Guide [2023 Updated] - Simplilearn

How to Build Docker Images with Dockerfile | Linuxize