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Template is a special term for Fandom wikis. It refers to a special type of page that is different from an article in that it is intended to be re-used inside other articles and is rarely intended to be viewed directly. The more complex the wiki content, you can usually expect it to have more complex templates.
Since templates can be widely re-used, they are a key focus of portability efforts. There is also a tremendous variety of types of templates, only some of which are described by official template types.
Some typical template types are portability friendly, like Portable Infoboxes, and some are less so. Some templates are so unfriendly that they are better hidden in some contexts. What makes a template portable is too broad a topic for this page.