Answer
.dockerignore excludes files from the build context to speed up builds and reduce image size.
Quick Answer
.dockerignore tells Docker which files to exclude from the build context sent to the daemon. Without it, your entire project folder (including node_modules, .git, large test fixtures) gets sent on every build — slowing it down. It works like .gitignore — patterns of files/folders to skip.
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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