What is Instanceable and Non Instancealble portlet?

if the The portlet’s set of data belongs to community or organization then its non-instanceable  portlet.  Even if you add that portlet in another page it shows same data.

if the The portlet's set of data belongs to user then its called instanceable.

If Portlet is non-instanceable then we can add same portlet more than once on same page.
if Portlet is instanceable then we can add more than once on same page.


In other words, non-instanceable portlets by default all point to the same instance of data.
For non-instanceable portlets, the data a portlet contains belongs to the community or organization.


we have  instanceable attribute in liferay-portlet.xml

Set the instanceable value to true if the portlet can appear multiple times on a page. If set to false, the portlet can only appear once on a page

instanceable portlets have uniquely generated portlet ids.