title: Difference between JSP EL, JSF EL and Unified EL
body: <p>I would like to know the detailed difference between the Expression Languages (EL). 
  There is JSP EL, JSF EL and Unified EL.</p>
  
  <p>I would like to know the history behind the EL and what the latest EL is that is used in Java EE applications. Is it the EL common for all view technologies in the latest versions?</p>