Board Thread:Support Requests - Getting Technical/@comment-44493102-20200102120353/@comment-9605025-20200102192013

 something and 

These are called links. See Help:Links (overview of links) and Help:Links/Wikitext (description of wikitext syntax) for more information.

 

These are called file links. See Help:Adding images (overview of images) and Help:Wikitext (description of wikitext syntax) for more information.

 

These are called category links. See Help:Categories for more information. - You didn't ask about this but, since someone else mentioned it...

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When it starts with a namespace, it is a transclusion. Without a namespace, it could be either a template (the most common subset of transclusion), a portable infobox (the most common subset of templates), or a magic word.

 

If a wiki wants to make things confusing, it could be one of the previously mentioned things. However, when it starts with "#", it typically is a parser function.