Static means it won't change. Dynamic means it may change.
<h1>你好 StackOverFlow</h1>
Always show StackOverflow (static).
and
$name = "twalow"; <h1>你好 $name</h1>
The value of $name may change (dynamically).
So if you want to know if your website is static or dynamic, you may want to look at the code.