voice over internet protocol, also called voip,ip 
telephony,broadband telephony,broadband phone 7 voice over 
broad band is the routing of voice conservations over the 
internet or through any other ip-based network.voip 
services convert into a digital signal is converted to a 
regular telephone signal before it reches the destination.

VoIP (Voice over Internet Protocol) is simply the
transmission of voice traffic over IP-based networks.

The Internet Protocol (IP) was originally designed for data
networking. The success of IP in becoming a world standard
for data networking has led to its adaption to voice networking.

VOIP means voice over internet protocol. In which the voice is send through internet (or any IP network). For that the analog voice is converted into digital 
data and use appropriate CODEC (for bandwidth saving) and send through IP 
network. At the receiving end the digital data is converted back into analog 
voice.