How to find the specified component when back to fronted

Hi guys,

I'm confused about the component after request back to frontend,How to add the jsp to the jsp based on component.Such as followed code: <cms:pageSlot position="TopContent" var="feature" element="div" class="accountTopContentSlot"> <cms:component component="${feature}" element="div" class="clearfix" /> how to understand this code? Thanks a lot!