I want to know getting some information about VOIP and free mobile to mobile cal

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Hello Friends I lives in India. I want to know that what is the meaning of VOIP and how it works ? It is a software or tool can i get VOIP facility free by downloading. I heard that too many people use this facility and they make free calls mobile to mobile or pc to mobile. Can i make pc to mobile or mobile to mobile call free ? Can i get all the details or information which softwares i have and can i download the software through i make free mobile to mobile or pc to mobile call free ? O tried lot my i am not successed Can anybody help me about this. I lives in India please help to make calls free or get all the details or information of free calls Awaiting for favourable responses as early as possible Regards