title: iOS Deep linking and Universal link, how to deep link in ios
body: <p>I read that from iOS 9, Universal links are introduced. Please explain the different between Deep-linking and universal links.
  My objective is, a link will be sent in mail to customers. Let the mail says there is an offer for item A, and a link. On clicking the link</p>
  
  <ol>
  <li>If the app is installed then, open the app and launch specific screen showing item A</li>
  <li>If app is not installed then, download it from App Store and open it and launch specific screen showing item A</li>
  </ol>
  
  <p>What if there is a user login feature?</p>
  
  <p>If app is installed and user is not logged in then,</p>
  
  <ol>
  <li>open the app</li>
  <li>Launch login screen</li>
  <li>After login is success launch specific screen showing item A.</li>
  </ol>
  
  <p>How can these be implemented? How the links are configured for these?</p>