title: Differences between DFD (Data Flow Diagram) and Class Diagram?
body: <p>I need to know this differences in order to undestand how to use them right.</p>
  
  <p>Which are the differences of DFD (Data Flow Diagram) and Class diagram ?And,<br>
  Which are the best diagram to build a software?</p>
  
  <p>Thank you..</p>