Voice over IP (VoIP) is a method and a group of technologies for delivering voice communications and multimedia sessions over Internet Protocol (IP) networks, such as the Internet. This enables users to communicate via telephone over an Internet connection instead of a traditional analog connection.
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A viewport is the term for the visible area on a display device. It is used in design as a way to refer to the display screen and how layout fits into that screen. In Perspective, viewports are particularly relevant to container layouts and style classes.