-Template engines (also referred to as "view engines" by _Express_'s documentation) allow you to specify the _structure_ of an output document in a template, using placeholders for data that will be filled in when a page is generated. Templates are often used to create HTML, but can also create other types of documents. Express has support for [a number of template engines](https://github.com/expressjs/express/wiki#template-engines), and there is a useful comparison of the more popular engines here: [Comparing JavaScript Templating Engines: Jade, Mustache, Dust and More](https://strongloop.com/strongblog/compare-javascript-templates-jade-mustache-dust/).
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