title: What is safe area in xib in xcode 9?
body: <p>Can you please let me know what is safe area (highlighted in image) in xibs in xcode 9. and what is use of this?</p>
  
  <p><a href="https://i.stack.imgur.com/5RF1x.png" rel="noreferrer"><img src="https://i.stack.imgur.com/5RF1x.png" alt="enter image description here"></a></p>