title: What is `copy to target` in Build Rules in Xcode?
body: <p>When I goto <code>TARGETS - Build Rules - All</code> in Xcode, I am seeing some files asking permission to copy to target.</p>
  
  <p><img src="https://i.stack.imgur.com/1HtGx.png" alt="enter image description here"></p>
  
  <p>What are those files?</p>
  
  <p>Is it necessary to copy them to target?</p>
  
  <p>What will happen after copying them to target?</p>
  
  <p>I'm using xcode 4.6.</p>