VoIP stands for Voice over Internet Protocol
(Internet Protocol is referred to as IP)
Internet Protocol is the communication method used for all internet
traffic, the computer you're reading this on currently has an IP 'address'
for instance to enable it to connect and communicate on the internet.
Packets of data are sent to and from computers when communicating on the
internet, talking to each other via their unique
VoIP uses this same communication method to send
packets of voice information when you make a call from your computer
to whoever you are calling