what is the major purpose of gadget

[schakravarthy]

what is the major reason for using gadget as most of the widgets are already available in thingworx. what is the need for it?

[posipova]

To use along with Dashboards, more information in the helpcenter http://support.ptc.com/help/thingworx_hc/thingworx_8_hc/#page/ThingWorx%2FThingWorxHelpCenterDITAFiles%2FThingWorxModelDefinitionandComposer%2FVisualization%2FDashboards%2FGadgets.html

How to create Dashboards with Gadgets

Article Viewer | PTC

[schakravarthy]

Even widgets can  be used to create dashboards i suppose,so why specifically gadgets?