Voice over Internet Protocol (VoIP), is a technology that allows you to make telephone calls using a broadband Internet connection instead of a regular (or analog) phone line.

    The most benefit the user can get is that you  can talk all the tome with ever person you want without paying for the time.

This website provides some basic information about Voice over IP.

    In this website, you can find what is VoIP, what is the advantage and disadvantage of VoIP and what hardware and software needed to implement it.

Hopefully you can enjoy! :)