Answer
Each Dockerfile instruction creates a layer. Layers improve build speed via caching, reuse, and incremental distribution.
Quick Answer
Each instruction in a Dockerfile creates a separate layer. Layers are cached — if a layer hasn't changed, Docker reuses it from cache instead of rebuilding. This makes rebuilds fast. Layers are also shared between images — if two images use the same base, they share those layers on disk, saving space.
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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