VoIP phones are devices that allow users to make voice calls over the internet instead of traditional phone lines. They convert sound into digital data, which is then transmitted through the internet. This technology enables cheaper and often clearer calls, especially for long distances. These phones can be standalone devices or software applications on computers and smartphones. VoIP stands for Voice over Internet Protocol, and it has become popular for both personal and business communication due to its flexibility and cost-effectiveness. Users can also enjoy additional features like video calling and messaging.