VoIP stands for 'Voice over Internet Protocol'. It is a technology that allows people to make phone calls over the internet instead of using traditional phone lines. With VoIP, voice signals are converted into digital data packets and transmitted over the internet to the recipient, where they are reassembled and converted back into speech. VoIP can be used with a variety of devices, including computers, smartphones and dedicated VoIP phones. VoIP is often cheaper than traditional phone service and can offer additional features such as video calling and voicemail-to-email transcription.