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copied!<p>There are two types of tags in Git: “lightweight” and “annotated”.</p> <p>Lightweight tags are simply refs in the <code>refs/tags/</code> namespace that point to some other object. They are created by using <code>git tag <tagname> [object]</code> without <code>-a</code>, <code>-m</code>, <code>-F</code>, <code>-s</code>, or <code>-u</code>.</p> <p>Annotated tags are actually a separate kind of Git object (a <a href="http://www.kernel.org/pub/software/scm/git/docs/gitglossary.html#def_tag_object">tag object</a>) that point to some other object. Tag objects store committer information, author information, a message (similar to <a href="http://www.kernel.org/pub/software/scm/git/docs/gitglossary.html#def_commit_object">commit objects</a>) and they point to any single other object (different from commit objects in that commits point to exactly one <a href="http://www.kernel.org/pub/software/scm/git/docs/gitglossary.html#def_tree_object">tree object</a> and zero or more other commit objects).</p> <p>When you have an annotated tag, you usually also have a ref that points to it. Technically this ref is itself a “lightweight” tag, but we usually do not describe them separately.</p> <p>Normally, both kinds of tags point to commits, but they can point to any kind of Git object (tag, commit, tree, or blob). The <a href="http://git.kernel.org/?p=git/git.git;a=summary"><code>git.git</code> repository</a> has <a href="http://git.kernel.org/?p=git/git.git;a=tag;h=6019c27d966fe3ce8adcc0e9f12078eef96ca6ef"><code>refs/tags/junio-gpg-pub</code></a> that points to a blob that contains the maintainer’s GPG public key. Also, <a href="http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=summary"><code>torvalds/linux-2.6.git</code></a> has <a href="http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=tag;h=5dc01c595e6c6ec9ccda4f6f69c131c0dd945f8c"><code>refs/tags/v2.6.11</code></a> that points to a tree. Although tags that point to non-commit objects are technically allowed, they may break or confuse some tools, so they should be avoided, if possible.</p> <hr> <p>The syntax <code>^{}</code> suffix (described in <a href="http://www.kernel.org/pub/software/scm/git/docs/gitrevisions.html#_specifying_revisions"><em>gitrevisions(7)</em></a>) is the tag dereferencing syntax (sometimes called the “peeled tag” syntax). For tag objects, it evaluates to the first non-tag object to which the tag object points (it will recursively deference a chain of tag objects until it finds a non-tag object). For non-tag objects, it means the same thing as without the <code>^{}</code> suffix.</p> <p>The <code>refs/tags/Prod_Release_2.3</code> ref in your central repository points to the tag object named <code>30bd19ef190cf664356c715b56044ce739f07468</code>.<br> That tag objects ultimately points to some other non-tag object named <code>4ae15ee04c2c41bfc7945e66f4effc746d52baec</code> (probably a commit). </p> <p>Thus, <code>refs/tags/Prod_Release_2.3^{}</code> resolves to <code>4ae15ee04c2c41bfc7945e66f4effc746d52baec</code>.</p>

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