title: Grouping significance
body: <p>I just started to explore Quartz, and i was wondering whats the programmatic usage of "Job Key" and "Trigger Key". I see in these key it needs give the value for Group. I dint understood why we need this grouping in the program. </p>
  
  <p>Can please any one help me with this query. </p>
  
  <p>Thanks.</p>