What does the FROM directive in a Dockerfile specify?

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The FROM directive in a Dockerfile is essential as it specifies the base image from which a new Docker image will be built. This directive is typically the first line in a Dockerfile and is crucial for defining the environment in which your application will run. By declaring a base image, you are essentially establishing a foundation that includes the operating system, necessary libraries, dependencies, and any other software required to run your application.

Once the base image is specified, subsequent instructions in the Dockerfile can build upon it, allowing developers to customize the image further by adding application code, additional software, and modifying configurations as needed. Thus, the clarity of specifying a base image using the FROM directive plays a fundamental role in ensuring the resulting image is built consistently and effectively.

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