title: What is the use of defining <ui:fragment> tag in jsf
body: <p>I am new to JSF. I read about  tag. But I find only examples not about when to use and what if we don't use it?
   I want to know what is the real requirement for use of <code>&lt;ui:fragment&gt;</code> tag. </p>
  
  <p>Is it really necessary at any point? </p>
  
  <p>Can some body explain me with and without this what could be the output?</p>