Voice over IP (VoIP) is a technology that allows people to make phone calls using the internet instead of traditional telephone lines. It converts voice signals into digital data, which can be transmitted over the internet. This method often results in lower costs and greater flexibility, as users can make calls from various devices, including computers and smartphones. VoIP services can include features like video calling, voicemail, and conference calls, making them popular for both personal and business use. Some well-known VoIP providers include Skype, Zoom, and WhatsApp, which offer different functionalities to suit user needs.