What is the `Join()` method on `List().Join()` used for?
<p>I came across this</p>

<pre><code>List().Join()
</code></pre>

<p>And was wondering </p>

<p><em>How can the <code>Join()</code> portion in the above line of code (on the right side of <code>List</code> be used ?</em></p>

<p>This looks similar to the following :</p>

<pre><code>String.Join()
</code></pre>

<p>...but it has a more complex IntelliSense tool-tip as displayed below :</p>

<p><a href="https://i.stack.imgur.com/SiXLA.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/SiXLA.png" alt="convoluted join()"></a></p>