Editing Help:Transclusion (section)

===Substitution===
[[wikipedia:Help:Substitution|Substitution]] has a similar double curly-bracket syntax, and its action is similar to transclusion. When you preview a page with substitution wikitext in it, its action is identical to transclusion. But when you save a page with substitution wikitext in it, it differs in that it substitutes that wikitext with the actual wikitext of the template. 

For example, when <syntaxhighlight lang="wikitext" inline>{{subst:Like}}</syntaxhighlight> is saved, it would substitute that wikitext with the actual wikitext from the [[Template:Like]]. In practice, the main difference that this makes is that if an update happened to the wikitext of the Template:Like, it would not update any pages where <syntaxhighlight lang="wikitext" inline>{{subst:Like}}</syntaxhighlight> had already been saved.