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Roadmap to becoming a developer in 2022
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developer-roadmap/src/data/roadmaps/docker/content/101-underlying-technologies/102-union-filesystems.md

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Union Filesystems

Union file systems, also known as UnionFS, play a crucial role in the overall functioning of Docker. It's a unique type of filesystem that creates a virtual, layered file structure by overlaying multiple directories. Instead of modifying the original file system or merging directories, UnionFS enables the simultaneous mounting of multiple directories on a single mount point while keeping their contents separate. This feature is especially beneficial in the context of Docker, as it allows us to manage and optimize storage performance by minimizing duplication and reducing the container image size.

Visit the following resources to learn more: