Can i use VPN for my system?

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What is Virtual private Network(VPN) ? I heard about VPN many times. I am actually confused with it. Does VPN offer virus protection? There are a number of systems that enable you to create networks using the Internet as the medium for transporting data. It secures the private network as these systems use encryption and other security mechanisms to ensure that only authorized users can access the network and that the data cannot be interceptedMy operating system is windows7 . Can i use this for my system? I am writing a thesis at essay writing service reviews on the topic various types of computer networks. How can i install this for my system. How the virus protection is done with virtual private networks.