People use the word "Internet'' loosely to refer to both the physical Internet as well as the software applications that run on it. The physical Internet comprises the wires, optical fiber, satellites, protocols, and routing computers (what a technologist would consider the Internet). Examples of the software applications include e-mail programs, web servers, search engines, instant messaging programs, and file transfer programs. In this chapter, we use the term "Internet'' to refer to both the physical Internet and the software applications that run on it.
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