title: Which Software development process model is the most used by current companies?
body: <p>I have just completed my graduation in computer science.<br>
  Now I know about all software development process models i.e.<br></p>
  
  <pre><code>• Waterfall Model
  • Spiral Model
  • Iterative and Incremental Development
  • Agile Development [I don't know much about this]
  </code></pre>
  
  <p>But I want to know which is used the most by new - current companies?<Br>
  Is there any new model besides this, which is new and all don't know about it?<br></p>