Voice over Internet Protocol (VoIP) is the technology used to make phone calls over the internet. It allows users to transmit voice and multimedia communication over Internet Protocol (IP) networks, converting analog voice signals into digital data packets. VoIP is popular for its cost-effectiveness, especially for long-distance calls, as it can bypass traditional phone lines. Many services and applications utilize VoIP technology, such as Skype, Zoom, and various business communication platforms. VoIP has transformed traditional telephony by enabling seamless communication across the globe while providing features like video calls and instant messaging.