title: What is OAuth and how does it secure REST API calls?
body: <p>I have mobile application REST API calls which hits to my server without any token or security mechanisam.</p>
  
  <p>I want to secure my API calls. I am trying to understand what is OAuth and how it will secure my mobile app REST API calls which are hitting to my server?</p>
  
  <p>Also I want to know in details about the below fields which are used in OAuth . From where I will get below fields.</p>
  
  <pre><code>Consumer Key
  Consumer Secret
  Token
  Token Secret
  Timestamp
  Nonce
  </code></pre>