Welcome to the vBulletin support forums! In our community forums you can receive professional support and assistance with any issues you might have with your vBulletin Products.
Simply put, a template is the HTML code that displays various aspects of the forums.
When you're just starting out, one of the best things you can do is to turn the 'template name in comments' feature on. When this is on, you'll be able to see the names of the various templates in the source code for your pages.
Admin CP -> Change options -> Templates -> Add template name in comments -> Yes
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