2015-03-03 07:33:02 +00:00
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# Glossary
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2015-04-02 15:11:19 +00:00
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This page contains distribution related terms. For a complete Docker glossary,
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see the [glossary in the full documentation set](http://docs.docker.com/reference/glossary/).
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2015-03-03 07:33:02 +00:00
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<dl>
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<dt>Blob</dt>
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<dd>
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The primary unit of registry storage. A string of bytes identified by
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content-address, known as a _digest_.
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</dd>
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<dt>Image</dt>
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<dd>An image is a collection of content from which a docker container can be created.</dd>
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<dt>Layer</dt>
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<dd>
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A tar file representing the partial content of a filesystem. Several
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layers can be "stacked" to make up the root filesystem.
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</dd>
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<dt>Manifest</dt>
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<dd>Describes a collection layers that make up an image.</dd>
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<dt>Registry</dt>
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<dd>A registry is a collection of repositories.</dd>
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<dt>Repository</dt>
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<dd>
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A repository is a collection of docker images, made up of manifests, tags
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and layers. The base unit of these components are blobs.
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</dd>
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<dt>Tag</dt>
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<dd>Tag provides a common name to an image.</dd>
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</dl>
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