What feature is central to VoIP technology?

The central feature of VoIP (Voice over Internet Protocol) technology is conducting voice calls using an internet connection. This method allows users to make phone calls over the internet rather than using traditional telephone lines. By converting voice signals into digital data packets and transmitting them over the internet, VoIP enables more efficient communication that can include additional features such as video calling, data transmission, and multimedia integration.

While traditional communication methods such as postal services or physical document delivery focus on non-digital methods and physical presence, VoIP emphasizes the use of digital networks to facilitate real-time voice communication. Additionally, the flexibility of VoIP allows for more than just audio communication; it can integrate video and other data, broadening the scope of interaction beyond simple voice calls. Thus, the ability to conduct voice calls using an internet connection accurately captures the essence of VoIP technology.