Renders string and is useful for debugging purposes.
render :inline => "time now is "
Render the text.
render :text => "Rock and Roll ain't noise pollutions!"
Renders the action's template but does not call the action
render :action => :action_name
Renders the template:
render :template => "controller/action"
Renders the style
render :layout => :admin
Renders the partial
render :partial => partial_name