<unk>  are<unk>  from any page (most notably articles) in one Wikipedia language to the same subject in another Wikipedia language,  between language versions of Wiktionary, and the same within Wikisource, Wikiquote, and Wikibooks.
The<unk> feature works also on Commons, and produces<unk>  to the Wikipedias. This is not reciprocal: a<unk> from a Wikipedia to Commons is an in-page<unk> 
They appear at one or two edges of the webpage (in Monobook on the left, in Classic at the top and bottom) after Other languages:, and show the names of languages for which a<unk> is available.<unk>  look like external<unk>  (or different, depending on CSS), but the syntax is more like internal<unk> . They are a form of interwiki<unk> . See m:Meta:Interlanguage<unk>  for details on<unk> ng different languages on Meta.
Interlanguage links
Speech communication
Paranoiac knowledge
Pragmatic language impairment
Multilingual support 
Autism pathophysiology
Theory of cognitive development
Disorder of written expression