I&#x27;ve noticed that a lot of people (though not the author of this article) confuse the terms &quot;lambda expression&quot; and &quot;closure&quot;.  Perhaps this confusion is worth taking a moment to address here.<p>A closure, as explained in the article, is a pair of a code pointer and an environment.  It is an object &quot;inside the machine&quot; that exists at runtime.<p>A lambda expression is a syntactic entity, a piece of source code: something you can see on the screen.<p>A lambda expression <i>evaluates to</i> a closure, just as an integer literal (a string of digits) evaluates to an integer, or a &#x27;new&#x27; expression evaluates to an instance (object).