distribution/docs/glossary.md

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# Glossary
**TODO(stevvooe):** Define and describe distribution related terms. Ideally,
we reference back to the actual documentation and specifications where
appropriate.
**TODO(stevvooe):** The following list is a start but woefully incomplete.
<dl>
<dt>Blob</dt>
<dd>
The primary unit of registry storage. A string of bytes identified by
content-address, known as a _digest_.
</dd>
<dt>Image</dt>
<dd>An image is a collection of content from which a docker container can be created.</dd>
<dt>Layer</dt>
<dd>
A tar file representing the partial content of a filesystem. Several
layers can be "stacked" to make up the root filesystem.
</dd>
<dt>Manifest</dt>
<dd>Describes a collection layers that make up an image.</dd>
<dt>Registry</dt>
<dd>A registry is a collection of repositories.</dd>
<dt>Repository</dt>
<dd>
A repository is a collection of docker images, made up of manifests, tags
and layers. The base unit of these components are blobs.
</dd>
<dt>Tag</dt>
<dd>Tag provides a common name to an image.</dd>
</dl>