title: What is a service in ZF2
body: <p>I have searched a lot to understand what is a service and why and when should we use them? What is the best way to create a service? What is its difference with plugin?</p>
  
  <p>I have read resources from <a href="http://framework.zend.com/manual/2.3/en/modules/zend.service-manager.intro.html" rel="nofollow">here</a> and <a href="http://framework.zend.com/manual/2.0/en/modules/zend.service-manager.quick-start.html" rel="nofollow">here</a>.</p>