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, enabling clear and cost-effective communication. VoIP stands for Voice over Internet Protocol, and it has become popular for both personal and business use due to its flexibility and lower costs. These phones can be physical devices, similar to traditional phones, or software applications that run on computers and smartphones. VoIP technology supports various features like video calling, voicemail, and conference calls, making it a versatile choice for modern communication needs.