A softphone is a software application that allows users to make voice calls over the internet using a computer, tablet, or smartphone. Unlike traditional phones, softphones utilize Voice over Internet Protocol (VoIP) technology to transmit audio data, enabling users to communicate without needing a physical phone line. Softphones often come with additional features such as video calling, instant messaging, and call recording. They can be integrated with other applications, like customer relationship management (CRM) systems, enhancing productivity for businesses. Popular softphone applications include Skype, Zoom, and Microsoft Teams.