how can we use ParaView
 

Hello FOAMers
how can we use ParaView and if it is included on OpenFOAM installation or it is another installation file which should be installed.

Thanks and excuse me because of this maybe simple question.

I'm not sure I understand your question.

Yes, ParaView is included with OpenFOAM.
You can use it by running paraFoam on an OpenFOAM case.

But ParaView can as well be used as a seperate software for visualization - regardless of OpenFOAM. Simply download it from http://www.paraview.org/