Interactivity is commonly defined, in computer science, as a two way communication system in which response is direct and continual. In digital media we are essentially talking about a interactive communication system between a person(s) and a digital machine which has been programmed by another person or persons. The important point here is that a human being is interacting with a digital active programmed machine.
Websters defines interactivity as mutual and simultaneous activity on the part of both participants, usually working toward some goal but not necessarily.
Interface (or Human-Computer Interface)
Most basically the interface is the hardware and software through which a human and a computer communicate. As the concept has evolved it has also come to mean the cognitive and emotional aspects of the user's experience when interacting with computer software.
A network of networks that share a set of protocols, such as TCP/IP and FTP. The Internet has
grown from a network of U.S. government and university servers to an international network that
encompasses commercial organizations as well. It wasn't until the World Wide Web was established
in the early 1990s that the Internet became versatile and easy to use, and its popularity is now
expanding at an exponential rate.
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