Answer
A Dockerfile contains step-by-step instructions to build an image such as selecting a base image, installing packages, copying code, exposing ports, and defining entrypoints.
Quick Answer
A Dockerfile is a script of instructions telling Docker how to build your image — start from a base image, install packages, copy code, set the startup command. Every instruction creates a layer. Docker reads the Dockerfile top to bottom and assembles a ready-to-run image from it.
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SugharaIQ Editorial Team
Verified Answer
This answer has been peer-reviewed by industry experts holding senior engineering roles to ensure technical accuracy and relevance for modern interview standards.
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Source: SugharaIQ