Answer
Docker sends build context to daemon, executes each Dockerfile instruction as a new layer, caches layers intelligently, and outputs a final image ID.
Quick Answer
docker build reads the Dockerfile, sends your project folder (build context) to the daemon, then executes each instruction in order. Each instruction creates a new layer. Docker checks its layer cache first — if the layer hasn't changed, it reuses it. The final result is a new image tagged with your name.
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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