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<p>You can assign keywords to your attachments using <strong>tags</strong>. Unlike categories, tags have no hierarchy, meaning there&#8217;s no relationship from one tag to another.</p>
<p>What&#8217;s the difference between categories and tags? Normally, tags are ad-hoc keywords that identify important information about your attachment (names, subjects, etc.) that may or may not apply to other attachments, while categories are pre-determined sections. If you think of your site like a book, the categories are like the Table of Contents and the tags are like the terms in the index.</p>
<p>You can change the display of this screen using the Screen Options tab to set how many items are displayed per screen and to display/hide columns in the table.</p>
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<p>When adding a new tag on this screen, you&#8217;ll fill in the following fields:</p>
<ul>
<li><strong>Name</strong> - The name is how it appears on your site.</li>
<li><strong>Slug</strong> - The &#8220;slug&#8221; is the URL-friendly version of the name. It is usually all lowercase and contains only letters, numbers and hyphens.</li>
<li><strong>Description</strong> - The description is not prominent by default; however, some themes may display it.</li>
</ul>
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<p>The &#8220;Attachments&#8221; column at the right of the table gives you the number of attachments associated with each tag. You can click on the number to get a list of all the attachments with that tag. The heading on the list page(s) will display the tag value you&#8217;ve selected.</p>
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<p><strong>For more information:</strong></p>
<p><a href="http://codex.wordpress.org/Posts_Tags_Screen" target="_blank">Documentation on Tags</a></p>
<p><a href="http://wordpress.org/support/plugin/media-library-assistant" target="_blank">MLA Support Forum</a></p>