title: Do curly braces mean anything in PowerShell variable declaration?
body: <p>I have come across variables (or parameters) being declared like this:</p>
  
  <pre><code>${var_name} = "Hello world!"
  </code></pre>
  
  <p>As far as I can tell, this is no different to the following:</p>
  
  <pre><code>$var_name = "Hello world!"
  </code></pre>
  
  <p>I am wondering if the <code>{}</code> braces in the first example do or mean anything. Do they change the behaviour of the variable? </p>