Transclusion is generally the inclusion of the content of a document into another document by reference.

Transclusion

The syntax is {{Namespace:Pagename}}. In short, some transclusion examples: If the source is in

Template ns (for ex "Template:Welcome"): use {{Welcome}}
Main ns (for ex "Lore"): {{:Lore}}
Other ns (for ex: User:Example): {{User:Example}}
If source is a subpage of the target (for ex « Transclusion/ja ») you can use subpage name, without the ns: {{/ja}}

What will transclude from a page can be controlled with the tags <noinclude>, <onlyinclude> and <includeonly> placed in the source page wikitext.

wiki code	What is rendered here (source page)	What is transcluded there (destination page)
<noinclude>text1</noinclude> text2	text1 text2	text2
<onlyinclude>text1</onlyinclude> text2	text1 text2	text1
<includeonly>text1</includeonly> text2	text2	text1 text2

{{Special:RecentChanges|namespace=10|limit=5}}, produce:

No changes during the given period match these criteria.

It does not work with FR/DE/... wikis (gives a 301 nginx error).

In game

To include wiki pages in game, see Templates under Category:IGtemplate: all between {{IGend}} and {{IGstart}} will be displayed in game.