{{Commons category}} links to a "Category:" name in the Wikimedia Commons repository that corresponds to the article or category. If the Commons category name is misspelled or missing, the link will still appear "blue" even though the link will fail. Check the existence of the category on Commons as well as the spelling of names carefully. That said, Pi bot will attempt to fix or remove links to non-existent categories. In articles, this template should be placed at the top of the last section on the page so that it floats to the right of that section. A warning will appear if the Commons link is not on Wikidata.
The two parameters catname and showname (1 & 2) are optional, and are intended for cases where the Commons category name is different from the Wikipedia page name. The first parameter is the name of the corresponding category on the Wikimedia Commons, without the "Category:" prefix. If this first parameter is used, then the template will display the Commons category name, which may be confusing to readers. This text can be overridden by the second parameter, where the Wikipedia page name would typically be used.
For example, on the Polar bear page, {{Commons category|Ursus maritimus|Polar bears}} produces a link to Commons:Category:Ursus maritimus displayed as "Polar bears".
The parameter |position= accepts one value, |position=left, that moves the box to the left side, instead of the default right side. More information may be found at Template:Side box.
Generally:
Do not place this template in a section all by itself without floating left. Do not place this template in a section containing columns without floating left. Do not indent this template with colon (:) or a bullet (*) markup.Specifically:
This template compares locally-defined values against the interwiki links to Commons stored on Wikidata. The discrepancies are highlighted through the addition of maintenance categories. Pages can be removed from the tracking categories by correcting the local link; removing misplaced template uses; fixing the sitelinks on Wikidata; or expanding the category system on Commons. Ideally there should be one Commons category link per article, and it should be easy for readers to identify the related content on Commons. Some suggested approaches are:
The link is to a more general topic than the article:
There are links to multiple Commons categories in the article:
The Commons category links back to the wrong Wikipedia article:
TemplateData for Commons category
This template creates a small box containing a link to a category on Commons. If no value is provided the Commons category value from Wikidata is used, and if none was provided there then the page name is used.
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